I've been spending my weekend arguing with paleos. You would think this group would just give it up already. There new technique is that veganism is not sustainable. Second, that banning meat would only create a black market. Here's there links. Any advice fighting these people would be nice.
https://gpfarmblog.wordpress.com/2013/02/05/can-the-world-go-vegan-a-studied-viewpoint-re/
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Paleos do their own research and whatever, so they're already in their own set. It's better to talk to people who have 0 idea about nutrition because they won't be opposing too much and most know the benefits of veganism already, they only need a nudge.
No one wins when you argue with Paleo people. They are too far in the opposite direction to even consider our ideals. You're better off talking with normal people who are just naive to the truth about factory farming and the health, environmental, and ethical benefits of being vegan.