We've seen Doug and Carrie be absolute assholes throughout this show's nine seasons but S8, E5 is truly some of their worst work yet.
We always knew Carrie thought she was better than Holly but after learning she met a nice successful guy who wanted to marry her, it absolutely consumed her. She's always treated Holly like crap, like the episode where she got sick and Holly cooked for her even when their conditions reversed. But this just is lower than low.
As for Doug, he can't let his friends have anything. The previous episode was bad enough where he threatened to drown his coworker if he didn't invite him to his BBQ, but now he has to make someone else's party be about his own envy.
Sidenote: where does that guy sitting at the booth behind them get off asking Deacon to sign "his" menu? Since when do menus in a sports bar belong to customers?
"I'm sorry things worked out for me"
Another thing: Doug drinks from the gravy boat and puts it back.