Cheftza, as I mentioned earlier, I’ve never had any issues with people eating at my house. I don’t serve them foods without a hechsher, and they have no problem with the keilim.
Truthfully, do you really know what goes on in other people’s kitchens? I believe there is a concept that it is permissible to eat in someone’s house if they are shomer shabbos (correct me if I’m wrong).