TMs sample seems to be just as focused as mine. From his description, it sounds like the majority of his interactions are with gays. Since the majority of the population is not gay, that would make his view of general society skewed.
That's not really the point at issue, nor do I think you can say that the majority of Tragic Monkey's interactions are with gay men (though that might be true). I think you can say that he has more knowing interactions with gay men than you do, and he therefore has a better idea of how gay men behave in general, and in different situations, and also whether any are likely to be in the military, for example. Given also that he is more likely to know if someone is gay, he's likely to have a better handle on what proportion of the general population is gay.