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Kind of depends on WHY your friend is a vegetarian, doesn't it? If he just thinks it's a healtheir lifestyle (or doesn't like meat), then what difference does it make to your friend what you do?

If he has veganistic beliefs, it's a different story. In fact, I'd be shocked at his reasoning.

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Indeed that is relevant. He is a vegetarian because he is an advocate for animal rights. I believe Peter Singer is the one that first convinced him of it. He operates under the following reasoning: By reducing the demand for meat, he is reducing the number of animals that will be raised for slaughter. Thus, as long as the sum of his actions result in the same total demand for meat as him simply not eating meat, then it is irrelevant who actually consumes the meat. I agree that this is probably a pretty unconventional view among vegetarians, but I think it is consistent.