Because there is a general entitlement of superiority in the game industry; on average, they feel like they are a technically superior and way more fun form of programming compared to anything other job in the IT industry
Sure. Everywhere I worked there had been people from all countries and continents but Antarctica, working together without any problems but they are, apparently, racists.
You know, I'd rather be with friendly "racists" who have not fired anyone over their alleged "racism" than anywhere in Tech, where one seems to have to be conforming to the party line even outside the work in order to keep the job (e.g. Adria Richards incident).