In my limited experience, it's not that
In games and movies it's usually:
This character who famously has been hetero, now suddenly bus gay and we just recon that they were always gay, you just didn't notice
Which is then followed with a "huh?"
I rarely see people having issues with characters being gay or trans or anything really, it's just when it gets shoehorned in really badly, or when everything about the show/movie/game is really bad, but my main character is gay, so now you MUST LOVE THIS PRODUCT!
Just make a good product, and I honestly don't care if your main character is straight, gay, brown black or purple