I have feelings about this topic. Second only to my doctor, I have personally gotten the most grief from gay men. This probably has something to do with the company I keep, but they seem to look at transexuals...differently. When I identified as trans my partner and our friends all thought it was neat. When I started dressing they accepted me into their group and made me feel as comfortable as I could in public, because I'm a pretty damn homely woman and needed all the help and confidence I could get. When I started growing breasts they all abandoned me. I wasn't one of them anymore, and it hurt, a lot. None of my gay friends stuck by me, one by one they have lost contact over the last 6 months. The man I had shared a home and bed with for years and years beat the living daylights out of me, after never having laid a hand on me in anger or even so much as called me a name for the duration of our relationship.
So currently it just so happens that all I have are straight people and one or two transexual women in my very small circle of friends. Frankly, I have made no effort nor have any desire to rejoin the community. Gay men don't like women, they like men. A healthy gay couple does not have one member wishing he was female, they are quite happy being boys. We are different from them on a fundamental level, and people react to those differences in their own ways. I can't say what that woman's motivation was, maybe she thought opposing gay marriage would make her more stealth, I dunno or care, everyone is entitled to their opinion, even ignorant ones. We aren't the same creatures, it's society that lumps us together. Our political fates are joined, but really, in my opinion, that's where the similarities end.