Dude... Ive played support skarner, Support jarvan, Support trundle(before it was a thing.), support ziggs, top braum, top AP aatrox, mained jungle tryn, and now I main AP mid Sion.
I could keep going on and on with this list, but to just sum it up, been playing off meta in ranked for 6 years, never been banned. Never been suspended, Never even had a warning. And dude Im not toxic, but Im also far from perfect in chat, I get frustrated, and short with people all the time.
So from my experience, it's NEVER just about what champ you pick, and where you go with them that results in a ban. Ive played top kogmaw, WITH A RIOTER IN GAME!!! So yeah man..
Sorry for the rant, but people like OP drive me nuts. You can play how you want if you play to win, and act decent.
Ill usually get at least one dude a week hardcore rages at me for a pick I choose, and then trolls, and ruins the whole game. Guess who gets all the reports.. Not me. :-D
Also last little tidbit on this subject, I do get reported, or at least they say they'll report me, and I tell them to go ahead, and I don't even worry about it, because Im THAT CONFIDENT, that as long as I honor the summoners code, I'm good to go.