Do you only look at leaks? Do you not actually read the manga? Toji was an absent father tsumiki and Megumi basically raised themselves. Child megumi didn’t give a shit about someone who wasn’t there, and couldn’t even remember his name or face. Teenager Megumi never gave a second thought about his father despite gojo telling Megumi he could ask him questions later. It makes perfect sense for Megumi to find some humor in the note especially with how gojo worded it, it has his annoying personality all over it! The manga isn’t anywhere near perfect however It’s not a “fuckass manga” you’re just fucking illiterate! Hope this helps 🫶