Why do some people refuse to acknowledge their mistakes?

Everyone makes mistakes. To err is human; to forgive, divine." as Alexander Pope put it — although I doubt he had a teammate bumping him off an easy save just to miss the ball himself in mind. But the mistakes themselves aren't what bothers me. It's the complete lack of acknowledgement afterwards.

There's a clear distinction between mistakes and mistakes worth acknowledging. I don't expect a "Sorry!" for every lost 50, unfortunate double commit or missed aerial. I'm talking about the blatant, avoidable ones that directly cost your teammate a goal. A simple "My bad!" takes two button presses, clears the air immediately, and we lock in for the kickoff.

To me, repeatedly refusing to acknowledge those mistakes comes off as a massive ego thing. Obviously I'm not talking about people with chat disabled, I'm talking about those who happily reply "Thanks!" to a "Nice one!" or "Great pass!", then go radio silent when they're clearly responsible for conceding. After a few blatant mistakes like that, it genuinely starts to piss me off, especially if they then turn around and blame me for the loss.

Taking responsibility for a mistake isn't the same thing as regretting that you tried. A simple "Yeah, that one's on me" is basic courtesy to me.

And yes, at the end of the day it's just Rocket League. The mistakes mean absolutely nothing once the game is over. But if you're incapable of acknowledging when you're clearly at fault, even over something this meaningless, that says far more about you than the mistake ever could. To me, that's a character trait that extends far beyond the game.