My lesbian friend from highschool claims she's a straight guy. How am I supposed to behave around her?

At first I thought it was a good idea to treat her as I would any of my guy friends. She got mad when I started raggin on her about not liking beer. Straight guys rag on eachother, but (s)he's aparently not as much as a straight guy as I was lead to believe.

Do I continue treating her as if she was a lesbian, or treat her as she's a straight guy like she thinks she wants, but obviously truely doesn't.