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The letter's not weird -- I can't count how many full-of-themselves straight men I've known who are exactly like this guy -- but the answer and too many of the posts about the letter are outright bizarre.
Gay men telling straight people not to go to places where gay men are? Yeah, there's a blow for equality and civility. Gay men writing in the most vulgar and immature ways possible to, essentially, "accuse" this guy of being gay? Definitely the image we all want out there. Not only are we childish and sex-obsessed, but being gay is something we'll use to make fun of you. How progressive.
To these posters, I suggest getting past wishing it was you that the couple sent a drink to and hit on and getting out and meeting some people who actually spend some time outside of your local gay ghetto. This guy is a classic straight male egomaniac, down to accessorizing himself with a woman who can and will never measure up to his beauty. Regardless of her appearance, this woman can't have an abundance of self-esteem (else why is she with this jerk?), so perhaps she feels that a handsome man who only emotionally mistreats her is the best she can ever do. He gets to put her down and be worshipped by others -- what more could any straight male egomaniac ask?
Any guy this into himself and needing this level of attention who was actually gay wouldn't waste his time pretending, even to himself, that he were heterosexual. A man can always get more attention from other men than from women, so lying to himself or others about his sexual orientation would just stand in the way of getting what he seems to desire most: lots and lots and lots of attention. The fact that he isn't gay is obvious by the fact that he's with a woman he cares nothing about. That's classic dysfunctional straight male behavior. Dysfunctional gay men, on the other hand, take tend to take their insecurities out on other men, as evidenced by too many of the posts here.