Guest etiquette

Ok question context - had my youngest best friend over for a crash over for mine’s birthday. The following morning I made pancakes for breakfast. Now I make my pancakes from my grandmothers recipe that’s been handed down. Super simple and they taste great! This kid took one bite and stopped eating. I asked if everything was ok and he says, I’m just not feeling good. Much later that afternoon his mother calls to ask what i served her son cause he came home hungry. I told her I made pancakes to which she asked “what brand?” Confused I said from scratch. To which she said whose brand is that, I’ve never heard of them. So I clarified by saying I made them from a recipe. She yelled at me that I wasn’t listening to her. Pancakes come from a box and she wants to know which brand of box I got the pancakes from. I then recited my recipe to her and she said to me, I’m not stupid I am a chef so I know how to get the pancakes from a box you just add water, so tell me what box. I said to her, well I can appreciate that you as a chef must know a lot about recipes, I have to make dinner now so I’ll let you go.
How would you handle a child who has never experienced food made from scratch? Or their enthusiastic parent who makes interesting statements. Was I an a**hole?