Its one thing if a player is deliberately trying to aggravate you and you respond negatively
Its another thing when im playing the game, minding my own business and not talking to anyone, and then my midlaner starts ranting about how im "fk trash" "this adc is so bad" "15k damage, see? fk trash".
I dont wanna sound like an SJW (which is now a derogatory term on these boards for some reason, gj everyone) but this is just harassment and should warrant punishment. Responding negatively to a player talking to you like this is bad, yes, but shouldnt warrant anything near the same punishment as the person who started attacking you for no reason.
(Disclaimer: i did not get a punishment or something, just wanted to say this)
Summary: responding negatively to someone provoking you =/= someone attacking you for no reason