True, but who would have known? Only Alberforth and Ariana, and I don't think Alberforth would have mentioned it (maybe he was homophobic) and we know what happened to Ariana.
If there is a stigma about having non-magical blood, can you imagine the stigma there would be if the wizarding community discovered that you were gay?
Rita Skeeter may have been able to dig it up, but she probably thought that turning Albus's and Harry's relationship perverse was a better selling point.
"[Gore] was widely perceived as arrogant. If you know something, you're not smart. You're a smarty-pants. It's annoying. People get annoyed with your knowledge. It goes back to high school, to not doing your homework ... 'There's something I should know, I don't know why I should know it but someone knows it and I don't. So I'm going to have to make fun of him now.'"
-Sarah Vowell, The Partly-Cloudy Patriot
Updated On: 10/20/07 at 12:02 AM