Poor Kevin with his hangover. I like that they imply Kevin is around even if they can't have him in the episode (I know with other shows there's a "thing" about number of episodes, etc.)

I guess I'm in the minority, because I enjoyed the episode and laughed a quite a few moments.
I thought the stereotypes were OTT intentional and Dean's always been opinionated about such things. I'm not saying I personally agree, only that I'm on board with Dean behaving that way as it's kind of how I'd expect him to behave.
*shrugs*