You're good. Though not for the reasons you think. It is not insulting because it is bigoted. No. Bigotry is just funny these days. It is sooo 1998. It is offensive because it disregards a skill-set every gay person has to learn at a young age. Namely, being a circumspect and otherwise sly motherfucker (or... brotherfucker, for all the gay men). You learn things when you are a young gay or bisexual man. How to not look. How to look without being noticed. How to walk like you are straight (it is all in the hips and shoulders) to pass among normals. How to disguise the voice (if applicable). How to read straight guys to see how homophobic they might be through casual conversation. How to use passive and active gaydar without being noticed.More to the point, I can't speak for the LGBT members of the board, but I would have found your 'arguments' downright insulting for the reasons I outlined. If I am out of line there or it didnt bug them they're free to correct me (I'm sure I can count on someone like Mr Coffee to set me straight in that regard) but that alone earned you alot of the responses you get.
It is like calling the KGB incompetent.