In the old days we didn't care if there were nuts, e-numbers, MSG or gluten. We weren't rabid vegetarians or vegans and we knew how much we could spend. Gen-Z can look up menus before reaching the restaurant and find out prices, using the interweb.
They are weak. Let them stress themselves into early graves. Let their morbid Goth-like features dissolve into obscurity and become pale as their bodies are denied proteins; their bodies filled only with the gruel of their ideologies.
Alternatively, don't go to a restaurant.