I get what you are saying, boring tv sucks. This was not someone that they were just buying a hat from. This will be someone that will interact after the kids get married. Not setting up a good relationship there with mocking her lifestyle, her hats and just being snotty overall.
It was just bad manners all the way around from them. How hard is it to be gracious to someone that is going to be part of your family? Hanna lived a different lifestyle then them, even rejecting their lifestyle all together. Instead of being happy she found her way in life, they had to knock it down to their level of thinking.