Reply #212: I don't think it's defensiveness. I think it's plain old annoyance.

[Marr]

Vegetarians' preaching can be as annoying as evangelists' preaching. It's easy enough to just ignore a thread, but if you also hear this in everyday life, you may be inclined to get a little testy.

What's more, this list just isn't well thought out at all, or at least not researched. Humans are the only primates that eat meat? That's not even close to being true, but even if it were-- so what? We're the only primates that swim, IIRC-- doesn't mean we should get out of the water.