Yes, this story wasn't interesting when pity case sicky Shamiko was getting bullied constantly. Story started to get really good when uptight arrogant Momo starts to take a little shit and gets bullied. And that's also why the story sucked when it went back to the status quo of Shamiko being bullied and Momo being untouchable.
You feel bad for Shamiko
Its funny when someone with a lot of pride like Momo takes some shit.
You need pride/dignity for it to be funny for you to take some shit, and for it to be interesting to see you get bullied, because in that moment they lose face. Shamiko has neither; Gosenzu has a lot of underserved pride at least which is why she takes shit on occasion. You gotta have face in order to lose it. More a character is built up and can't afford to look foolish, the bigger the fall when they trip on a rake and get hit in the face.