The point he makes about the Peta ad is very interesting to me.
I have been vegetarian for years and I am always surprised when people ask me why.
I think a more reasonable question would be "Why are you not a vegetarian?"
I don't own a pet or like animals. But I feel it's not my right to have animals slaughtered for my eating pleasure. (note I am not talking about medicine research or any life-threatening kind of scenario).

Even across the atheist community, I think there is still a feeling that humans are the superior race somehow, may be remanent from the biblical vision that the world and its animals were somehow created for us. And as such we have a right to kill them (humanely preferably, so not to hurt our sensibility too much). That strikes me as odd.