Monica

I meant in the sense of "not relevant", not in the sense of "that's your problem not mine". For example, I never cared about whether sauces I bought to cook with contained MSG, until I had a friend with a strong MSG allergy so now it mattered and I started checking if we were eating together. I don't think the talmud is talking about non-Jews who have Jewish friends and yet don't worry about what's in the food; I think it's more like how if I go into a non-Jewish bakery it's a good bet that the pie crusts are made with lard (which I'm told is superior to other fats in that context).

In modern times we've all gotten more aware of diverse dietary needs; we probably have vegetarians to thank for pie crusts without lard starting to be available, same as we now instinctively pay attention to peanuts, transfats, and the like. I doubt this sort of concern was as prominent then.