For Simon, one of the major indicators that he and his family are changing in fundamental ways is that holidays don't feel the way that they used to. On Halloween, Simon muses at length that his costume (a dementor from Harry Potter) is nothing like what he wore every year as a child (girls' dresses)—and while he's uncomfortable now with the fact that he loved wearing dresses, the fact that he's spending Halloween drinking beer instead of trick-or-treating throws his growing maturity into sharp relief. On Christmas Eve, he notes that even though his family "hits all the traditions" such as making truffles and singing the Chipmunks theme song, the day still manages to feel different and uncomfortable. Holidays then become a symbolic representation of the changes that the Spier family is grappling with, while also underscoring the inevitability of those changes.
Holidays Quotes in Simon vs. the Homo Sapiens Agenda
“I completely see the appeal of being someone else for the evening (or in general). Actually, I was a bit of a one-trick pony myself when I was little. I was always a superhero. I guess I liked to imagine myself having this complicated secret identity. Maybe I still do. Maybe that's the whole point of these emails.”
It's Christmas Eve day, and something feels a little bit off.
Not bad, just off. I don't know how to explain it. We're hitting everyone of the Spier traditions.