Yup, to be honest it feels like the big problem here is not that the kid has to go on vacations she isn't thrilled about (since even the disapproving parent concedes she's a good sport) and more that these parents can't observe that one of their kids is different--even different in a really trivial way like vacation preferences!--without turning it into a crisis about how to get her to be more conforming. Obviously no kid is entitled to the exact vacation of their choice 100% of the time, but going to the beach a couple of times might be a way to send a message to this girl that her parents don't actually think of her as an impenetrable alien whose strangeness gets in the way of everyone else having normal fun--just another human whose likes and dislikes are part of the same spectrum as everyone else's. If they can't get that message to her somehow, the vacation thing is kind of a moot point.