It’s not heterophobia. It’s wanting to see yourself represented in games.
Homosexual/Bisexual representation is important. You can’t really say a game’s inclusive if it allows heterosexual playthroughs to skip any and all queer content, never so much as glimpsing a gay character least their delicate sensibilities be offended. Yet this is what is constantly offered.
If the only gay characters in a game are gender-flippable romantic interests then it’s fully possible to play a game with absolutely no gay content. (The same’s almost never true, that games exist with absolutely no heterosexual characters). This isn’t inclusive. Sure it’s catering to gay players, but it’s missing a lot in terms of representation.
In Dragon Age 2, straight players were in huge uproar that Anders hits on male characters, regardless of whether or not they’re attracted to men. They found it extremely uncomfortable. It’s just that general attitude of it’s okay to have same-sex attracted characters, as long as it’s possible to ignore them, which is only just slightly more tolerant than games shouldn’t have GBLTQ characters at all.
It’s so frustrating to be shoved in a box, told you shouldn’t exist, that you shouldn’t matter, that children and heterosexual gamers should be protected from your very existence and able to opt out.
It’s also frequently the case that same-sex attraction will be allowed, but only if it’s women. Straight men find lesbian relationships, far more acceptable than that of gay men.
You’ll find stuff like in Heroes Rise, all Black Magic’s past relationships are with women.