If a straight, male bartender gave you a free drink in a heterosexual bar, you'd think you came on a come-up. But when it's a gay, male at a gay club, now it's stooping low.
Completely different situations.
At the gay bar, you are accepting free drinks from "potentials." (in their mind).
At a hetero club, that situation wouldn't be present.
The same way women accept drinks from dudes that they aren't in to is the same thing you would be doing at a gay club. It is deception. If you aren't interested in that person, don't accept their gifts.
But it is such a common practice that people probably don't even think of it as deception. But in my mind taking gifts from someone you have NO interest in is deception.