Bar from Koala it wasn't at young age
And we don't know what happened to Koala after Fisher tiger's death
Moreover Hancock After being free went back to her Island which is no men's Land so her opinion about men's his highly influenced by her experience with Cd's
Do I like Hancock's character? No. I don't like her personality at all (much less her obsession with Luffy), but I understand it.
She is a deeply traumatized woman who went through unspeakable things while being held captive, and was force-fed a Devil Fruit at a young age. It's not fair to compare her to Shakky who, as far as we know, had a pretty normal life.