I usually just dodge if my team seems unusually dumb in the character select screen. Yeah, you gotta wait 30 mins but that's what smurfs are for. And the trolls don't really stop as you go higher ELO. They might even get worse because some people just get a random ego boost because they've broken 1600. Suddenly they think they're the shit, and can do whatever they want. If someone tries to impede that, then they'll troll. I've had most success duo queue with jungler and support. Whoever is jungling tries to get mid and top fed, and whoever is supporting tries to first not feed their AD and second, try to get your AD farmed. You'll get control of Dragons and sometimes their buffs. I may be paranoid, but I usually end up dodging if anything fishy happens in champ select. Someone trolling, someone trying to run something stupid, or general stupidity in chat. The 30 minute wait + playing a smurf game is better than playing a 20-50 minute game and possibly losing elo.
One thing I've noticed is you'll get strings of games where your team is completely awful. Yet, you'll also get games where you get a really solid team 2-3 games in a row. I tend to try to ride the lightning, and stop after 1-2 losses if it's due to asshattary.