No.
I feel like I would be way dumber if I were straight. That's not to say that straight people are dumb, but rather that because of the unfavorable positions I have been put throughout my life because I am gay, it has opened my mind to a lot of things about oppression, social issues and society in general. I feel like if I were straight, I would feel comfortable staying ignorant on some topics because they wouldn't affect me personally, therefore never really learning as much as I did.