Of course not every competitive player is like this but 90% is due to the competitive mode of any kind, it's not just in TF2, its also in Overwatch. The competitive mode is just a toxic creating place due to people want to win, if they don't or if someone messes up on their team. Then the team ( Blue ) will get angry at that player for messing up and then the player who gets yelled will start yelling back and then the entire team is yelling, then the other team ( Red ) will just mock the yelling team and then ( Red ) team will win due to the yelling and the stress. The ( Blue ) Team will be yelling more due to losing and then words will be thrown around that should not. ( Red ) The team will be also stroking their egos after the game due to the win. So Competitive games are not a good thing to play. At least in MvM and Causal mode you could always leave if the team is toxic, Competitive traps you into the toxic game because you would lose rank or banned for a few days if you leave. I know that MvM has one wave penalty if you leave before you complete wave one, however that is just one wave. It's not the entire game. So basically competitive game mode and its majority of players are not good for anything.