Your effortless translation of "90% white" to "assholes" is a bit of a tell. For instance, you're white, and used to thinking this kind of trashing a group of people is ok because of your socially dominant position. Because these whites resemble you physically right? But of course you mean the bad whites; you're one of the good whites!
It isn't ok, and let me remind you, you have no basis whatsoever to believe that teams which are 90% white are made up of assholes. It's something you made up and it's racially obnoxious behavior which you should stop immediately.