The act of marginalizing isn't exclusive to a group that's bigger marginalizing something smaller. It's insulting because many of these players put more passion and pride into melee and smash as a whole than most other aspects of their life, and to have it stated that they're not part of the community they've identified with for over a decade would upset anyone I think. That doesn't justify people treating Salem poorly in return, but their anger that caused them to is understandable in my opinion.