They do not like the way you hvve peeled the poattoes. Your side of the discussion will go like this: I am sorry I did not peel them corectly...yes, I imagine I was being lazy just then. I am sorry....Yes, I suppose it was a bit stupid too, I will do better...I am sorry I did not mean to be disresctful toward you for peeling the potatoes improperly, but i know it upset you...I did it and it was wrong. I am sorry. It will not happen again." And that is how it goes. no hint of talking down to them or becoming defensive in any way, or you will regret it. The next time you need to peel the poatoes you remember and do it as carefully as you possibly can. You ask them if it is ok. They are not dys-regulated that night, so they barely glance at them on the plate. "whatever, it's fine."
It's really about learning to communicate in a counter-intuitive way. In your scenario, I'd say:
"I'm open to learning from you- show me your way to peel potatoes."
If that didn't work, I'd follow up with, "I love you and I don't want to ague over potatoes. I'm going to step away for a few minutes and we can figure this out later."
If things stayed tense after I came back, I'd switch to, "I'm sorry if how I peel these makes you upset, that was never my intention. Tell me how to proceed- should I keep peeling potatoes or would you rather do them?"
If that didn't resolve the conflict, I'd say, "You know what, I'm not in the mood for potatoes anyway. I'll grab something else to eat so we both have time to calm down." Then I'd get in my car and head for a local restaurant for one of my favorite foods.
What I wouldn't do is argue, defend, or blame- I'd stay until I start to anger, then I'd walk away. And I would do this for everything, every single time, with very clear boundaries in place. If you want to talk, I'm here. If you need help, I'm here for you. If you want to verbally attack me, I'm walking away and I'll be back when you've calmed down.