It seems like everyone has some sort of dietary restrictions and/or preferences these days, and finding something that everyone can eat is often fairly difficult.
It’s a serious matter too: an allergy (such as peanut or shellfish allergy) can be life threatening.
A food intolerance is usually a less serious condition - in that it doesn’t involve the immune system - but still, it should never be taken lightly.
A food preference is different though.
Some people don’t like fish. Others eat no meat, egg or dairy. I, for one, am not a big fan of gluten or refined sugars — but I don’t get sick if I eat a slice of pizza or a bagel.
These are personal choices, but they should be respected nonetheless.
I consider myself a tolerant person and what a person does in their own living-quarters has always been entirely their own business.