The thing about discussions like this is that so many racial/ethnic/whatever stereotypes are re-usable generic accusations that it’s easy to look at a bigoted characterization and see a bunch of different potential targets. A lot of bigotry is very Mad Libs, basically near-standardized rants where the bigot fills in the blank spaces to specify the accused group. You can look at a lot of bigoted rants from a hundred years ago about the “Yellow Peril” or whatever and outside of the dated word choices you could swap out the references to Asian people for “illegals” and it would fit right into the modern bigotsphere.
The mention of switchblades is the standout exception, because that isn’t one of the standards.
Food can certainly give people a smell; the chemicals that give food a strong taste and scent don’t vanish when you eat them, and different food ingredients produce different metabolic byproducts, some of which can be smelled even by humans. You just don’t notice it when it’s your smell, it’s those other people who smell weird. And of course to a bigot any noticeable difference is going to be “bad”, not just different.
Yes, here.