Earlier quoted context omitted.
My mother simply does not understand what a "carbohydrate" is, let alone the relationship between starch and sugar, or why things like mashed potatoes are not low-carb. ("But I didn't use any butter in them, so they're low-carb!") When left to her own devices, she will consistently confuse and/or conflate carbs and fats. I think this is because she's from a generation that totally bought into the war on fat, and rais…
Well, fat certainly is worse than carbs, as far as weight loss is concerned. Fat contains twice the calories per gram compared to carbohydrates or protein, that's why things like cheese and oil are a big no-no if you're trying to lose weight. Butter is alright as long as you don't take a big ol' chomp out of a stick.
It's not strictly speaking a rebuttal, but it illustrates a point quite clearly, fat is not the culprit.