Look, smell sensitivity is a real thing

but you only get to police what lunch someone takes to school

with eg very young kids who can't be trusted not to share their food with other kids and life threatening peanut allergies

or little kids who eat peanut butter, don't wash their hands, and then toss a basketball to the allergic child = deadly reaction (yes, this has really happened)

Incidentally, I have smell sensitivity to some foods (nausea, migraine)
and the foods that are most likely to set me off are
English/British foods or foods mainly eaten by white people

eg vegetables boiled into submission, either unflavoured or covered

in a cheesey white sauce.

eg cooked brussel sprouts

other cooked vegetables;

Barbeque (it's the smoke smell);

steak (especially, but not only, Osso Buco)

beef pie;

The idea that "ethnic" food = smell sensitivity is LW's racism/xenophobia showing.

For me, at least, spices or onion or garlic don't cause me smell issues.

(I can't EAT spices or onion or garlic because my digestive system sucks, but that's a seperate issue)