The novel implies that Julian is the way he is (rude, exclusionary, and mean) because his parents are that way—specifically his mom. After Jack punches Julian, Julian's mom is fine with Jack returning to school, but she demonstrates shocking closed-mindedness when she suggests that it's too much to ask for her son to be nice to August. She even tries to get August removed from Beecher Prep altogether, though she eventually ends up pulling Julian out of school instead. She also unabashedly edits the fifth grade class photo to get rid of August and distributes the photo to several other parents.
Julian's Mom Character Timeline in Wonder
The timeline below shows where the character Julian's Mom appears in Wonder. The colored dots and icons indicate which themes are associated with that appearance.
...maybe Charlotte. August wants to know what people's reasons are for not coming, especially Julian's. Julian's mom was the only person who didn't respond at all, and Mom jokes that the apple... (full context)
Jack: Season's Greetings
Jack: Letters, Emails, Facebook, Texts
Jack: The War
...happened because Mr. Tushman forced Jack to be friends with August. Charlotte says too that Julian's mom is pushing the school to review August's application, since some assignments have changed a bit... (full context)
Jack: Why I Didn't Sit with August the First Day of School
...what Charlotte shared about Julian's vendetta, though he leaves out stuff about the holiday party, Julian's mom saying that August has special needs, and the rumor that he snapped because of pressure... (full context)