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Gay guys would be more likely to think you were gay if your hag was fabulous and sexy in a flamboyant way. They probably think you are with some frumpy earth mother for some other reason (maybe she's your sister).
The guy in question is a wanna be bone smuggler if there ever was one/and or a narcissist. Reminds me of my next door neighbor in the dorms senior year. Kept coming out of the shower to "show you my tan line" and wiggle his ass in front of me. Walk around shirtless. Drop hints about how he thought it would be cool to have limited opportunities to fool around w/ a guy.
He either wanted it or wanted attention. Either way it was fun, but not worth the effort overall. But the limit of what gay guys would do to him is show interest--feel him out for his interest (as the couple that sent over the drink did). The escalation happens when you GO OVER TO THE TABLE, YOU IDIOT. Basically, the letter writer is encouraging this interest, consciously or unconsciously.
I don't care how hot you are, there are plenty of fish in the sea and unless you are giving someone some kind of cues that you are at least somewhat interested (either from desire or narcissim) you aren't going to be surrounded by fawning gay guys. These guys can hook up in minutes on gay.com or go to a bathhouse. They aren't going to waste time on someone who isn't giving at least some cues of interest.
In closing, I have a suggestion--why doesn't the writer stop dressing and acting like a gay guy if he doesn't want to get hit on.