To draw an incredibly stretched comparison to vegetarianism instantly tells me everything I need to know about the way you think. It's overwhelmingly sanctimonious.
I understand why you would think that, and I did too at first, but I'd encourage you to give the post another read. What the author's trying to do is precisely the opposite. He wants a good social script to ensure he's not sanctimonious or argumentative: he's sure your brisket is great, he's got no problem with you and your friends enjoying it, but he's not personally interested in it because he doesn't eat meat.