Whoa, I’m really sorry that your aunt said something so mean-spirited. Even if she disagrees, there is no reason to be so hurtful about it.
My brother and I had a little (mostly joking) argument last fall when I was researching keto. I was… “yes, I CAN eat salami and bacon and cheese and ranch and lose weight and not have a heart attack.” He made me a salami/cheese/ranch sandwich (as in two slices of salami with some cheese and ranch between them- gross) in jest, and we had a good laugh.
He did say that he’d consider it if a year from then I was still following the “diet” and had lost weight… so now, that’s my goal. Prove him wrong
But ultimately, get him to consider this way of eating, cause goodness knows my whole family has insulin resistance issues, even if he has been able to stave off the obesity factor with his man genes and height 