Flaming someone doesn't do anything, just because you flame them isn't going to make them play better, it just makes them play worse. Next time a future teammate is doing bad and feeding I would first mute everyone in the game enemy team and everyone on my team. That way you have no reason to talk to them or respond to them when they are feeding and you avoid the " GET REKT" from the enemy team and the "GG" for your teammate. Second try to make more "picks" ganks-pressure off team- ping more etc.
Top lane that is fed is hard for some mids to gank or help, because most cases they are too tanky or have enough Damage to kill both you and your top. I would just let your top laner do their best until late game teamfights. Most tops players will give up the first tower if behind and don't want to die again, which is FINE. The top tower is the least important among the 3 first tier towers. With the smaller gap between your 2nd tier top tower and the enemy 1st tower is a long way from "SAFE" so ganking the enemy top should be easier and safer as you are closer to "home base" and can get a much easier help from the jungler as its between their jungle rout.
Bot lane is more important as you have a chance to get a double kill- Tower and/ or Dragon off the roam. You also have 2 laners plus yourself and sometimes the junglers help to get the enemy bot lane. If it works its 2 assists for everyone who didn't get the kills for themselves which is worth.
All n all I would just ward for your own safety first and follow your jungler when they ping for a gank I would follow, your jungler isn't the only one that can gank but with back up it makes it easier.
Have a Good One !