Re: She's not wrong (a quick question)
I went Veg for a bout a year in my youth. I did not do it well; and did not get anywhere near the amount of protein needed for continued health. I learned that a lack of protein, say from living on microwaved potatoes for years, can seriously impact brain function. I quit being a vegetarian when an acquaintance asked why I had gone veggie, and I had no answer. I could not remember why I had made the decision to cut out all meat. I knew it was a big enough reason to justify a major life-style change, but I had no idea what it was.
So it is very possible that your house mate could not remember how long to nuke a potato, due to poor nutrition.