Just came back from HKG this week. Was largely on Kowloon, but did some time on HK Island. I wasn't specifically looking for gay bars, but saw a couple. Quite honestly very open and all the bars we went to were fun. If you're looking for a specific type of bar I don't have any advice. If you just want to make sure you are ok wherever you go - I had zero problems and was there for 1 week solid.
Very much enjoyed Aqua (bar and restaurant - different floors) and it was a very trendy, but still casual place. The views (assuming it isn't foggy) from there are truly fantastic!