As an ACOA, I learned not to take up for myself.
It wasn't overtly told to me, but it was implied. I think it comes from a combination of factors: low self-esteem, over-controlling, authoritarian parents, parents not wanting to be bothered with children's needs.
I was way too timid to take up for myself. I'm not any more. I don't put up with near as much from people as I used to.
Can anybody relate?