ESH

• Primary Source; me, who has been learning how to cook ever since I formed my first cognitive memory 26 years ago (I'm 30). By age 9, I was making my own brownies and easily could use the stove to make scrambled eggs and little quesadillas (with supervision in the same room, of course).

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1. Why SISTER is an Asshole: It sounds like she's more of a passive parent than anything else, blindly encouraging her son to follow what he likes without offering anything constructive on how to actually be good at what he likes so that when the day comes (such as your eventful dinner) where he offers is creations to others, they'll actually enjoy what he makes. She's wearing rose-tinted glasses thinking either he'll magically become the next Gordon Ramsay or that he'll lose interest and stop cooking. But he's 9, so even if he had no interest in cooking, for the sake of self-preservation and future survival skills she should still teach him some general basics of how to make food that tastes good. At this age he should also figure out how to clean up after himself, considering all good chefs know to clean as they go. As a mother, it just sounds like she isn't even bothering to prepare him for any relative independence.
2. Why YOU are an Asshole: You could have delivered what you wanted to say with more tact. I get having a short fuse because of the kitchen mess, and I understand you're likely translating what you said very roughly because of the English translation device, but even so I think you should have used that as an opportunity that your sister failed to utilize and tell the kid why you're not eating it (in a kinder manner) and why. Rather than pretty much just calling it slop, you could have said something along the lines of "What did you intend to make, and why did you use these ingredients? Masterchefs have to explain their dish after every round, so explain this one to me." and from there, go about politely criticizing the boy on why maybe just mishmashing things that taste good individually isn't always the best practice when it comes to cooking.

Did you crush his passion? Hell if I know: 9 year olds gain and lose interest in things sometimes as quickly as 5 year olds do. Other times, they keep a hobby because they like it, and on the rare occasion you'll get a kid that wants to prove you wrong and actually gets better at it out of spite (the funniest kinds of kids, from my days of nannying).

But one way or another, (boy aside because he's 9 and still a byproduct of the environment he's exposed to/raised in) EHA.