It was a good episode. Peggy lost a lot of (baby) weight, and I don't think Joan was being sarcastic with regards to giving Peggy respect, I didn't notice any mischief in her eye or tone of voice. I actually missed the last few episodes of last season so It was hard to piece things together. And, I wasn't surprised by the behavior exhibited by Betty with the two truck driver. I think that part of her has always been simmering beneath the surface, especially because she wasn't at all disgusted by the fact that her former roommate was a tootsie.
But, the men are still assholes, which is probably why I like watching the show. The more it progresses, the worse they look.