I think you should date whomever makes you comfortable and happy. It shouldn't matter if they are/aren't gay. In all honesty, that stigma for gay relationships is still there, but there is more tolerance now then ever. If you're in the US, Obama recently supported gay marriage and is paving the way for future equality between straight and gay couples.

Date who you love. Be with someone you can cherish and enjoy. Don't make yourself date anyone you don't want to because it's socially acceptable.