I think the audience was shocked that he admitted he'd "married up" -- out of his league, as it were -- and were waiting to see if Tereza thought that was a joke -- it's kind of like commenting on how successful your wife is at picking up sailors ... they did finally laugh because let's face it, that was funny. If you were not his wife.
She didn't look very happy at the end. First she has to put up with his unnecessary touching of Edwards, then he puts her behind his dead mother. She is gonna sell his boat tomorrow!