I don't think the point is whether someone playing Grim Fandango is gay or not. Adventure games do not involve interaction with other humans, so they don't really relate to the guy's article.
While I do agree to a point that this article isn't hugely necessary, I will absolutely confirm that the mainstream gaming community (particularly the action gaming community) is intensely homophobic. I don't even know if the individual people making up that demographic are homophobic, but as a collective they sure as hell are. It's so rampant as to be offensive to me just as a person, sexual preference aside. Quite frankly, I don't care if I come off as some kind of bleeding heart, but I think it's appalling and a bit frightening that to call someone gay or a fag, or a queer, or what have you, instead of using some generic insult, has become the norm. I think that young children (in particular boys) who grow up in this environment (which seems to be just as common in elementary schools) and who think they may indeed be gay are going to think there's something seriously wrong with them. Regardless of whether that's the intent or not, if you're struggling with the possibility that you're gay and you learn to equate "gay" with "stupid", that quite simply cannot have a positive effect. That worries me, and it seems completely and utterly unnecessary. There are a myriad adjectives one can use that go beyond sexual and racial slurs, but those two categories seem to make up by far the most common among pre-teen and adolescent (particularly young teen) males.
Perhaps I'm making too much of a big deal about the whole situation, but I quite simply can't help but feel disgusted about the whole thing.