It's possible and sensible to acknowledge that people have had bad experiences while also acknowledging sexism, regardless of whether said sexism stems from experience. Prejudice is prejudice.
Saying women aren't sexist if some men have wronged them is like saying white supremacists aren't racist if someone from the race they discriminate against stole their car.
I really don't want to upset anyone by saying this. But I am speaking my truth, my experience, just as you all are speaking yours. Paint me whatever villain you see fit, say whatever denigrating things about me you want. I am a respectful human being who sees all sexes and races as equal, and nothing that anyone says will ever change that. If that somehow upsets you, then I'm sorry you are so far gone.