Bleg. I Get It.

Found this joke in a TNR comment thread. I don't get it. Please explain.

Guy walks into an anti-TNR, anti-Scott Thomas Beauchamp blog.

The moderator writes, "Welcome, newbie. What do you do for a living?"

The guy replies, "I'm a taxidermist."

One of the blog regulars writes. "A taxidermist? Now what the heck is a taxidermist?"

The guy replies, "I mount animals."

All the blog regulars reply, nearly at once, "Welcome!" "You're one of us!" "Glad to see you!" "You know Hillary's a lesbian, don't you?" etc. etc.