What you should have done was put on your coat and told your mother not to speak to you like that again and you'll await her apologies then leave. Don't enter into a debate just walk.
I, ve got to the point where I am emotionally completely detached from her. it's water off a duck's back now. it doesn't upset me. I feel nothing. It use to tie me in knots and in my younger days I would have been groveling to win back her favour, "it's okay mum I, 'll eat it like that" etc at which point she probably would have chucked it in the bin, because "I was being ungrateful and obviously didn't want it", so I don't play those games anymore.
She's old and she won't be here much longer as callous as that sounds. I Just keep contact to a minimum, watch tiktoks when she phones me and do the odd umm, yes, ahh, ok because she's not after a conversation, just wants to talk at you.
I only visit with an exit plan so I don't have to stay longer than an hour etc.
As long as she stays independent it's bearable. The issue will come if she develops care needs because that won't be happening ever. She's the type who would be obstructive about letting anyone in her home because she's under the deluded impression that her family has nothing better to do than take care of her needs That's going to be a rude awakening. But we've all discussed it and are on the same page.
@speakout you deserve a medal, I couldn't do what you're doing. My mum once 'jokingly' suggested she sell her house and use the money to convert my extension into a granny annexe. Before I could stop myself I blurted out. don't be ridiculous. I would kill you within a week. She still thinks I was joking.