If you didn't see it, I'm not going to link (that guy doesn't deserve to be main character two days in a row). But you've probably seen that conversation play out some other time. Someone stating a left-wing commonplace who gets very angry when people point out it's not true, or more complicated.
A lot of the time, these commonplaces make people on the left feel good about themselves. "British food sucks because the British were colonialists but also too stupid to use spices" is obviously sus, but it makes you feel superior about your own country's relationship to immigrant food.
I used to be a lot more dogmatic about the "cultural appropriation" aspect of food culture, and I still think there are some pernicious things there. But when you see the lengths people take it to, clearly just to feel good about themselves, it's clear that the concept has been wildly misused.
once I saw people dogpiling on an Argentinian with a German surname for saying that her grandparents had to flee Germany during WW2 following the tired “German-Argentinians are all nazis” trope and of course she turned out to be Jewish.