Big Mom's like the worst example, she's a fucking monster(inb4 imp approves). There is tons of great female characters in shounen that don't need to be fucking monsters, there's tons that are also feminine yet still great characters. And no, having abs like Mikasa from AOT doesn't mean you are a strong female character, quite the opposite in fact. If I were to name my personal favorite specifically in shounen it's probably gonna be Maka from Soul Eater or Shampoo from Ranma...but I don't really care if a character's male of female, I care if it's a great character.

I am not dissing Big Mom btw, she's a great character but not one I'd call a great female character, she's quite the monster in her own regard.

What's their angle with shounen anyway? Shounen's for boys, it's in the fucking name no wonder you don't find the next War and Peace amongst it so some characters do fall flat. There's some examples where that's not true though(IMHO One Piece has got such great characters overall, amazing writing which is why I don't get the critique from the linked comments). Seems overall just reddit venting that they don't like certain characters in a genre predominantly aimed at boys.