It's a competitive shooter - you're always going to get toxic people unfortunately. I don't find it as bad as Overwatch for toxicity though.
What happens? If I remember correctly Quake is about as toxic as it gets but it's no different than I remember 2001 to 2004. Sometimes it's amusing, sometimes it's rolls eyes. Then sometimes they rage in chat and everyone chimes in getting all ragey telling them to shutup. LOL!