BM (Bad Manners) and Toxic are two different things.
Toxic is ruining your teammates game by flaming your own team, or int feeding, or blaming people.
Being Cocky, Emotes, and BMing is perfectly fine, and it is usually a bad idea because not respecting your opponents comes back to bite your butt, as you all know it happens to TSA every time they try to BM in the LCS.
Now this is an interesting topic because Chat client is in the game, and so are the emotes/voice emotes. One can get you banned while the other cannot.
I think chat should only get you chat banned, because it is in the game, and no one can control how it is used, same as the emotes with BMing.
Thats my opinion and I'm sticking to it.
[garen-swing]