How do I deal with a friend who rubs her relationship in my face?

I'm single and I don't mind it at all, to be honest. I'm not "sensitive" about it, or anything. But my friends keeps rubbing her relationship in my face. She keeps saying how it's so much better to be in a relationship than single. And when she asks me for a relationship advice, if she doesn't like my advice, she'll say "what do you know? you're single.". I'm tired of hearing of how big of a loser I am just for being single. What should I do?
How do I deal with a friend who rubs her relationship in my face?
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