I mean it's not like it makes me particularly angry or anything. It's just kind of demoralising when you're coming in with an improvement mentality and bobby big balls with 3 years of experience and 40k+ more kills than you beats you, and his character goes "ha ha you are trash m8 xD"
Fundamentally it's no different than manually sh*t talking your opponent (something that I assume is explicitly against the rules?), except the game automates the process for you every single time. I'm not against people doing that if they want to, but for me personally, I'd just rather not hear it when I'm learning a new game against experienced players. Let's say you were playing someone in, oh I don't know, SF3? And they beat you handily because they have years of experience over you, and after you lose, they look at you and say "wow bro, you are fkn trash LOL". Not conducive to a positive, improvement based atmosphere. Literally no logical or even technical reason why I shouldn't just be able to disable it and move on with my life. A single toggle in the options.