This pre season is kind of like...

i have never been a support or mage playing but i do know what you mean. tanks are still ok, or at least from what i have seen lol.

if you don't like a mage, tank or support type then don't play one. riot only condones your 'team' bullying you onto a specific 'lane'. not a champ, 'role' or item build. if they were to condone those as well, they would lose a ton of money at this point. so don't worry about it. just play a marksman or energy-based champ and if you geta temp ban just sellt he account once it's over and play smite or dota 2. you don't have to tolerate abuse, from othe rplayers nor from designers.