Why did my friend accuse me of being a homophbe?

At school, my male friend asked me of I was a lesbian, and I simply said "No."
My female friend, who's bisexual, said "Oh, so you hate LBGTs? What is wrong with you?" And I said "Nothing."

I don't get it. How am I a homophobe for saying I'm not a lesbian?

This happen senior year of high school.

I go to college that was 95% female (last year it was, but now we have more males), and I had four females ask me if I was a lesbian, and I said no. Why do people think I'm a lesbian? O_O
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+1 y
*happened*
Why did my friend accuse me of being a homophbe?
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