I really feel for you. I’ve seen and tasted a tiny bit of what you describe… but I’ve not come close to being where you are.
You are required to Honour your Father and Mother.
“Respect” when properly understood is included in Honour: However that does not mean Kow-Towing to their every whim, nor does it mean being a doormat for abuse.
Your Mother is required to Love you. She is required to forgive you. St. Paul, in his instruction in the New Testament to us to Obey our Parents (Fathers) in everything. but it is followed immediately with "Fathers do not drive your children to resentment [anger] lest they be discouraged.
The 10 commandments apply to us because they are a summary of Natural Law, not because they are part of the Law of Moses.
St. Paul’s writings are part of the New Testament and are not subject to a pick and choose attitude.
However… you are no longer a child. you are an adult. you live seperately from your mum, and your duty to obey her in everything is severed. If you were married it would have been replaced… but the authors of the bible did not describe the 20th century living arrangements.
You remain duty bound to Honour her, but to kowtow to her is not honouring her. She is now your equal, and it does her serious disrespect to pretend otherwise.
Others have given good guidance here on the practical methods of setting boundaries.
What I will say is this:
Time and Distance are normally a great healer in this type of relationship. Your mum will eventually come to recognise and respect you as an adult. you must do what you can to help her to get there. Be worthy of that respect.
Ask her to describe to you what she means by respect. help her see that respect is not kowtowing.
For me: I have said to my Mum that I will go out of my way to seek her opinion on important matters. That her opinion matters to me. But that I will use her opinion to make my own decision. If I do something different from what she advised it doesn’t mean I don’t respect her or want her opinion.
- Sometimes I know in advance that I’m likely to do the opposite of what my parents advise: but I’ll want to hear their opinion and reasons anyway. sometimes it will change my mind. other times they surprise me.
My relationship with my parents now is immeasurably better than it was when I left home 17 years ago.
When someone is being abusive to you, you are not required to put yourself in the way of that abuse. You need to define boundaries. You need to demand respect in return. That is a respect that acknowledges that you are your own independent person. that respects your mothers experience and interest in you, but is no longer subordinate to your mothers will and wishes.
If there are specific topics which are particularly contentious then they must be made taboo.
You mention clothing:That’s a classic example. Sure we live in a culture where there is pressure on our young men and women to dress in an immodest manner, and that
is an issue of morality, but beyond that your mum has no right to do more than say she doesn’t like your style. that’s all it is: a choice of style.