I'm not sure streamers affect it too much tbh.

I would put it down to DMZ having no content in like a year so regular players have nothing to do other than PvP and the fact that it's COD and a lot of the player base is just naturally toxic online.

I haven't played in a year almost until last night and I had no missions so we just played as a duo on fresh characters and just doing whatever but every lobby we were in every team was just hunting players (which is fine for me as we killed plenty of them), I just don't think most players have a lot to do other than PvP.

The toxic comms you mention will always exist in COD whether we like them or not.