Don't die in lane as ADC/Support
5/4 man ganked? Leave the tower. It's annoying as fuck, but if you're not dying they wont be unstoppable later.
Live to fight another day
I have problems getting my lane partner to not feed or getting my mid not to feed, or my jungle to not afk farm.
Just think about it for a moment. You know they are gonna gang rape bot lane, so why let them do it? It's like warding and then complaining you didn't see them coming.
Just take this into consideration. I get it, it is irritating as fuck when I get 5-manned at bot and my team is being retarded. Literally just let the tower go, lose a couple waves of minions, whatever. Just don't die more than twice in the laning phase.