My son was busy but I refused to charge his phone.
You are not his maid, he has to learn how to charge his phone for himself even when busy. Right?
He said I was a fucking bitch.
He has no right to call you that. He is your son and he needs to have respect for you. I would not tolerate that language from him if I were you.
I don't need him to help me and I'm busy too washing my clothes.
Well, maybe not now but remember there is always a future that is uncertain. Not to get on your case about anything either but later in life most people want to be as fair as possible. What if he refuses to help you when you are 75? Just worried you are not thinking clearly about this matter is all.