Hmm I think that your op isn't clear on what youre thinking
Smacking, washing your mouth out with soap etc was normal back then.
But being deliberately cruel, unkind, mocking and disrespectful wasnt. It sounds like youre confusing the two.
I dont agree with beating etc. But I do believe in a telling off - maybe in 20 years parenting will differ then and my dd will be a different mother
But my parenting is done with love. I love my child. I dont make fun of her, or insult her, shes the most beautiful sweet thing, even when she is driving me crazy!
When she is punished, with no cupcakes because she ran off, or wasnt listening to mummy, its not because 'shes pissed me off, so I want to spite her', its because 'she cant run off, I need to put a stop to this'. If that makes sense 😅
My point being, it sounds like your parents were(and are) deliberately unkind and cruel, rather than typical 80s parents
Yanbu to go no contact, but you have to be clear and make a choice. You cant say no contsct and then break it for a bit
Best of luck xx