You are jumping to the worst conclusion possible. I never said "all" adc's are toxic, but I did imply "most."
And, it is possible to know that low possible amount of "nice" adc's that I've played with because I legitimately could only think of maybe 3 (implying less than 3 since I know you'll just assume I meant 50), compared to not even knowing out of the total amount of games. These instances were so rare that I could actually remember them as distinctly nice memories.
Also, not adding to the hate, just giving further evidence behind it, you know, like a reason as to why we are voicing our opinions on the matter. Because it's a problem, that should be fixed, because there's no reason anyone should have to put up with that kind of behavior towards them every single game, or on a consistent basis. There's absolutely no reason to yell at your support (or anyone) for any of the following:
- you having low cs because you can't last hit properly
- you ending with a 1/5/0 score proclaiming to all chat that you "couldn't carry these noobs"
- you bitching for someone other than you getting a kill, or in other words; a KS rager
- bitching at your support for leaving you to die, after you ignore every single back ping, along with their wards
- not using/upgrading your fucking trinket. It's literally a free ward. Absolutely no reason as to not use it, let alone equip the fucking thing
- Again. You can actually ward, hell you can buy a ward if you have the extra gold.
- you can stop farming after 18/full build, the support does need to obtain gold sooner or later.
- No explanation needed:

- Trying to teach the support how to play support without even giving them the chance to show you that they know what they're doing
- Bitching about why there aren't any wards deep in the enemy jungle; Common sense tells me multiple things.
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- you can't get out of base without dying, how in the fuck would the support be able to do it?
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- you can ward too
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- already placed 3 wards (max limit)
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- refer to number 2
- calling them a feeder and asking in all chat for a report just because they died. no one can have a perfect game, every game. Even the pros make mistakes/have off games. We're human, we're not perfect.
- yelling at anyone for missing a skill shot. There's such a thing as dodging. You won't hit every skill shot, neither will we.
That's just naming a few off the top of my head. The list goes on. This is the shit that supports have to deal with just about every game. That is completely ridiculous. The laning phase goes badly, who gets blamed? That's right the support. Not you. And what do you when this happens? You claim that the support was intentionally feeding and should be reported. Do you wanna know the amount of times I've been reported for "feeding" even with a usual ending score of around 1/maybe 5/12? I don't know the exact amount of times, but I've gotten enough fucking warnings about that shit. I know you don't like being hated on just for being an adc main, but I can guarantee you don't go through even half as much bullshit as supports do. Anything bad that happens in bot lane is the supports fault according to most of the adcs I've had the displeasure of dealing with. Now I may not be the best support of all time, but I know damn sure you're not the best adc either, so there's really no reason to even try to bring that argument up.
Believe it or not, sometimes a match up will just completely counter the other. One lane will have an obvious advantage or disadvantage. If you're too ignorant to acknowledge that fact, you probably do a lot of the things on the list above.