Katie has been my favourite of the big three for the most of the game, but I feel like she has lost some of her appeal in the last couple of updates. Telling crude jokes has always been a part of her character, but now it seems to be her entire character. Katie doesn't normally make those jokes in front of other people, which shows that she is capable of self-restraint, so it's just odd that she suddenly just can't seem to help herself during the fancy dinner date. Especially since Katie tells you that she wants them both to show a little class during the date.
The day after is really awkward if you told her to tone it down a bit because she just keeps making all sorts of passive-aggressive statements about how she would like to make a joke but knows that you don't want to hear it. This gets old in a big hurry because I'm totally fine with it in private, just not out in public when we are in a place that requires a bit of decorum. Which I don't think is a terribly unreasonable position.
My favourite scenes with Katie are the ones where she doesn't tell many jokes at all. And it's not that I dislike their banter, it's just that I am much more interested when she speaks with sincerity. Listening to Katie talk about how she worries about her mother's self-esteem, how much she hates how Elaine and your father treated you, scheming up a plot against Roger and Natasha, those are the parts that I enjoy the most. The jokes are fun in small doses, but not when they overwhelm everything else. Then it's like trying to eat a cake that's 90% icing.