Let me put it this way...
Say a game wants to "realistically" recreate WW2 in the invasion of Normandy. The game is designed because the game-creators want to play in an era of realism during WW2 that captures the era, military hardware, squad tactics, etc.
While it may not be a popular decision with certain members of community, historical fact is that whites and non-white units were segregated during WW2. IIRC in the British Army soldiers could be prosecuted if caught having gay sex, and capture by the Nazis was horrible for everyone around.
Would non-white and queer concepts exist during WW2? Of course. However no one wants to RP eras where segregation and discrimination were fact. However...the thought exercise is to ask the following question:
"Is it bigotry if a person wants to run a historically accurate WW2 game and does not allow black officers, mixed-race units, or openly gay/trans soldiers during the game?"
I think that it would be unfair to call that person bigoted if what theyre trying to achieve is historical accuracy.
Which is why we play in mostly fictional environments, because playing historical realism in the past would be a minefield of bullshit.