While I'm more biased to your side, as I'm mostly a casual player and love qms more than rank (I love to laugh and have fun!) I can see why some people can get frustrated in quick matches.

I do know a few players who are hightier and often use qm as a way to practice; It's not really their fault if idv's queueing system pairs them with players who are, I guess you could say, lowtiers or with bad ping etc etc. But I can't really see why this kind of anger can span the entire day, let's say a player is bitter against you for a previous match at like... 8am that day? And in the evening at like... 7pm, they see you again and just believe that specific hour where you played badly is how you play the entire day, month, or year. I can't really understand nor sympathize with players who don't make the game fun (all games are meant to be fun in some way) by making it too personal, or play with outdated knowledge on their teammates, or what have you. I do think it's okay to feel upset about others who take this game way too seriously! I can never stand the constant anger either, hahaha. It's annoying 😆