Wait, so someone can ignore solid basic advice they should already know based on their elo and rank but clearly don't and go on forcing 2v2's or 1v1's or split pushing on a teamfight champ and feed 8+ kills in laning phase while I am camped by the enemy jungler 1v2 or 2v3 and I somehow am winning lane? And they are not trolling or helping the enemy team? As far as I can tell, If you make the same dumb play 5,6,7,...20 times in a game and someone who is clearly doing better than you tells you a simple fix for that, you ignoring that and continuing to make the same clearly bad play is trolling and aiding the enemy team. So after 3-4 times of telling someone nicely, I think they have established they are trolling and trying to lose; at which point, they lose any right to people treating them nicely and not being salty when the point out the dumb decisions and what the person SHOULD be doing instead. But for some reason, people only see the latter as toxic and flaming; not the guy who keeps trying to 2v2 a lane that already beat him 5 times - like dude, the 2v2 is not getting any easier at this point - they have more items, more levels, and probably a jungler who decided camping some other lane for no gain isn't nearly as good as walking bot for the guaranteed 2 kills or assists you are handing out every 1.5 minutes of the game.
Ya see what I mean? You see why some people "flame" or become "toxic"? Sadly some people don't listen to you kindly telling them something the first 4 times but for some perverse reason listen after you basically tell them that a play they made was stupid or an idiot play. I hate doing that, but what else is it if not an idiot play? Not calling the player(s) idiots, just the play he/she/they made stupid. It's like going to a grocery store every day and expecting that it will randomly sell yachts one day without ever changing into a different store. That's what repeating the same bad decision all game is like. Sounds utterly stupid when you put it that way, no? I much prefer to be positive. I overlook making a mistake once or twice provided you learn from it. If you don't and you continue repeating it, I will tell you - in a friendly manner at first. Someone doesn't have to be 8/0/8 hard carrying the game to have a valid point about what team should/shouldn't be doing; similarly, not every 8/0/8 player has a clue what the rest of the team should/shouldn't be doing. But if someone makes a point, instead of blowing up because your ego is hurt, consider what they are saying and if it has a valid point whether it was said nicely or not. If it is valid, it doesn't matter if the player is 0/11/3 or 20/0/1, you should listen to it. Put your "i want to be the solo carry and do things the hard/stupid way" aside, and do what is best for the TEAM. This generally involves several basic things which people from bronze to at least diamond 4 ignore:
Blue/red/jungle camp is not more important than a late game dragon - do the damn buff later.
Ward your flanks when you push up mid-late game - you get free trinket wards for a reason.
Rotate from your damn lane. If you broke the tower in your lane, it is generally much safer (unless team warded entire enemy jungle on that side of map) to shove out your lane and rotate to pressure another lane than it is to keep pushing for a tier 2 alone with only the 1 ward you have to place to protect you from the enemy jungler, mid, and anyone who bases from rotating to kill you. Furthermore, this helps catch up teammates who fell behind or gets them ahead if they were even.
Group up. If the enemy has tons of reliable hard engage and are playing as a roaming 4 or 5 man group, stop trying to 1-3-1 with champs that have no tp or global. Someone will get caught and you will lose more than you gain. Let the toplaner or midlaner with tp solo push and tp in when needed. It might also help them to tp in if team actually warded.
Stay close to baron - it dies really fast depending on the point of the game. You don't want to recall everyone or send them all bot when baron is up and the enemy team can rush it. Sure the adc or mid might REALLY want the farm to catch up, but they can't get to baron to stop the enemy in a pinch - leave that to the guy with tp.
Pressure the map. You see 3 or 4 enemies in a lane vs just 1 or 2 teammates? Rotate to help if you can get there in time to save them and/or hold tower. If you can't, shove your damn lane as fast as possible and either kill towers, group to dive the 1-2 enemies separate from their team after shoving to their tower, and/or do neutral objectives.
Gank the lane and be willing to wait more than 2 seconds to do so. You have a laner who is nearly winning while being camped 1v2 or 2v3 or 2v4? Great. Stay near them so you can counter-gank in time to help them - until the enemy stops camping. Why? Because with minor help, you will trade even or WIN every time. If a toplaner can get enemy top and jungle to 1/4hp or lower alone, imagine if you were there to help them. Maybe they should just have left, or maybe the enemy has too much cc for them to escape and they need to turn and fight and hope to win because there is no escaping the enemy cc chain. If you camp counter-gank for said laner, you will snowball 2v2 or 3v3 or 3v4 AND be able to counter-jungle SAFELY after winning the fight - instead of counter-jungling at your laner's expense. Moreover, instead of a laner who got screwed by you never helping and who will probably not lift a finger even if they COULD save you, you will have a laner who has your back if the enemy collapses when you invade their jungle.
Just go in. Both laners very low hp? They can die while trying to engage for their jungler to gank their lane just as easily as they can get a kill. As the jungler, it is on YOU to engage first and distract the enemy. As they blow abilities on escaping or engaging you, your laner can safely engage to help you - knowing the enemy's abilities that could have killed them before they locked down their opponent were used on you instead of them and they won't immediately die for helping you grab a kill.