People are constantly wondering why is “Oda treating Big Mom this way”, because nobody can lay a hand on Yonko.
Yes, Franky, Jinbe, Robin, Brook, etc.. have managed to land their attacks on her and toss her aside.
But she still didn’t take any damage. Big Mom literally hasn’t been injured even once in this series by an enemy attack.
The only time when we saw her bleed, it was when she fell on her knees because Mother Carmel’s picture was broken.
Meanwhile, just a couple of chapters ago we saw Kinemon, Raizo, Kiku and the other Scabbards pierce Kaido’s skin which was supposed to be impregnable. Whereas we never saw that with Big Mom.
People are yet to realize that Big Mom almost always acts as a stubborn angry child who rushes head first at other people without even thinking. She’s not very smart, but literally no one can dispute her strength. Different Yonko have different personalities.
In my opinion, it would be a boring story if every single Yonko acted the same. Big Mom doesn’t care about being attacked. She knows that she can tank everything.