> "Screaming at my friends and just constantly feeling angry and frustrated."

A former high school classmate was known to scream at other people during League matches, and I chalked it up to a personality issue and him lacking maturity (aka something highly abnormal).

This might still be true, but it actually sounds like competitive video games and the culture around them might really normalize this behavior as acceptable. It looks like I was too quick to judge him personally, instead of accounting for the context.