Surely this is illegal under the Services Act? To refuse service on the basis of one's sexuality? 
 
If people are causing trouble, then that's a perfectly justifiable reason to boot them. However it is not reasonable for a gay bar to judge homosexuality on stereotypes that many civil rights campaigners are actively trying to combat. Plus straight people enjoy the atmosphere of gay bars: my own brother has been in more gay bars than I have, and he says that he loves how friendly they are. If he were kicked from the door for his sexuality, I think he'd leave with a very different impression.

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