Honestly? By this point, I'd start finding it hilarious. I mean, it's so incredibly silly for him to do stuff like that. Definitely turn it into a private joke with friends. If he says it while your husband's out of earshot, just wait for him to get back. Then immediately tell hubby, in front of everyone, "You won't believe what John just said--he thinks I'm anorexic!" I'd guess that after getting laughed at enough, this guy will get the hint. Or not, in which case, hey, more funny for you.