The variety of responses to this shows how much of an emotive topic this can be. I based my response on living in world no and how it was in the past. From that perspective Gay only and Gay friendly establishments are wanted and needed, due to both feelings of comfort and belonging as well as feelings of discrimination. Yes there is some reverse discrimination mainly brought about by self preservation which is natural. The need and possibly the want will not go away until acceptance is total, but total acceptance is probably being idealistic and may never happen. It certainly won't in my lifetime.
One thing that doesn't help is the straight people that go to gay clubs and bars and then complain and cause trouble because they don't like to see gay people showing affection. This is happening more and more in the UK, what the hell do they expect? If they don't like it then don't bloody go there.
My point of acceptance is idealistic and probably will never happen. That being the case, Gay only and Gay friendly will always be wanted and needed.