"Sounds like you had a good head start, then!" Unfortunately, Chrissy's mother never seemed particularly interested in teaching her anything that didn't involve preparing to be married off after high school.

She's not angry about the self-deprecation so much as that she just doesn't believe what he's saying is true. "Oh. Jokes are fine as long as you don't actually believe that." It's not even her place to give him shit about it if he does actually believe it, but she's spent so long hearing her mother's criticisms that she doesn't like it when other people do the same to themselves. "I don't think it sounds like you're being an ass."