Casey,
((((HUGS))))! I think I probably would have told her off by now!

Probably something along the lines of "Anyone who lets a 4 month old scream to teach them they won't be picked up is obviously clueless about how to raise a child. Why would I even consider taking advice from you?"

You have had much more patience with them than I would have, but I understand wanting some adult conversation. I always found that sticking Lindsay in the stroller and going for a walk was a great way to find other adults to talk with, and it was also excercise. If there is a nice park with a playground near you, talk dd for a walk there. We don't have any real parks here, but I always found other mothers out walking their children on our street. In fact, we still do it, but now Lindsay rides her tricycle while I push Christopher in the stroller and try to keep up with her.
As far as Gymboree class, I never took Lindsay and she's perfectly fine! Babies need love and affection more than anything else. I think everything you're doing is just fine. I, too, value my sleep!

Personally, I would avoid any more contact with this couple. It sounds as though you are more miserable after you've been with them.
I really feel sorry for their son. That poor little boy is teething and probably going through a growth spurt, and they're just treating him horribly!
