Dean's used to the abuse; he gets it from Faith all the time, so it doesn't faze him, and besides, he likes a chick who isn't going to hold back. She looks a lot more at ease, and while Dean is actually probably worse off than when they first met, he's pretty damn good at suppressing it. So Judith gets a lazy grin.

"Yeah, we tried that back home, but the assholes get right back up again," Dean replies. And don't worry, his gun is under his pillow. "Beheading 'em is the only way. Least, it is where I come from. Not everybody's vamps are the same."