Perhaps our behaviour is governed by what we experience/see from parents and close relatives. My family can't handle that I now fight back (not physically!). As a child you think parents know best so go along with what they are saying/doing until old enough to realise some of it is a load of rubbish.
Sadly, I believe my mother's behaviour has shaped my life. In my twenties, I wanted to get away so hoped I'd meet a lovely guy. That didn't work out, but I learnt to handle things differently. I've become more private, so any new guy arriving on the scene now would have his work cut out removing the barrier. I shudder to think how I could have overshared with unsuitable people just because other relatives behave that way.
Love the boundary checklist!!