Can you get banned for playing whatever you want?
I rarely use the chat and I don't bother "fighting" with other players for my role so I just pick the champion I want to play with. I don't have preference which lane to take but I rarely agree to go in the jungle, so in a few games I can be top with another player. If I don't pick a support, then I go wherever a player is needed and start farming. Sometimes there is an ADC with me but I don't care. I pick my champion before some other players. They have a chance to pick a support but if they don't want to, then why should I care?
Is this really a bannable offense? Can I get banned if I ignore people who tell me how to enjoy my time even if I try to win the game? Can I get banned if I pick the same champion every time and try to farm if that will make it strong enough to be useful, even at the cost of someone else's farm?
EDIT: I know that one champion can be played in more than one role but if I choose to support, I pick champions that are good at supporting. If I play as a fighter or assassin, that means I don't intent to support.