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Sure, a lot of straigt people go to gar bars, and it doesn't mean they want to take a walk on the wild side, they just may like the music. And sure, a straight man can wear leather pants and it doesn't mean he has latent gay tendencies even if he isn't in a rock band. And sure, sometimes, someone mistakenly thinks you're on their team, and may send over a drink, and you've done nothing to encourage it.
But, you accepted the drink and went over to their table. That IS deliberately encouraging it. People don't send over drinks to be just friends, it's a pick up. Going over to their table only tells them their pick up is working. You're toying with everyone: those men, yourself, and your wife. For whatever reason (you're curious, you're gay, you're using passive-aggressive acts to punish your wife for something that makes you mad).
Imagine her humiliation in this situation as you've forced her to be your wingman while you play pick up with other men while she watches. Not nice. Figure out what's going on here and be honest with her.