Trash talk is unsporting, simple as that. I’ll also add that mute chat button exists for reason, so one can ignore the asshats that say “E.Z.” when you push the payload to their door after 25 minutes, or its a 99/100 point score.
While I generally agree trash talk is common, Blizzard has a commitment to make a better game than the typical one. Apparently you like to trash talk, clearly not just saying hello or general chat, no one reports on that. You do deserve a reprimand for mocking others however, apparently your parents didn’t do much to train you on this point so of course now society has to do it.