Well, it's fair enough to point out that if these side-splitting one-liners had concerned Sulu's race, they would be deemed totally unacceptable and would probably have been dealt with by moderators.
Having said that, the biggest problem with these jokes isn't that they are homophobic, it's that they are pish. It's the people who do laugh at this crap who need their sense of humour examined - not those who don't.