Personally, I think some of these folks just take it to the extremes with things like that. I wash my pots, pans, dishes and utensils after every use and doubt seriously if there is any "Meat" residue left in the metal of my stainless steel cooking vessels. However, if it is even remotely possible, just how much could there be.
I've got little patience for anybody that is that particular or demanding. I've got tons of food, if you're hungry, eat. If what I have doesn't please you, don't let the door hit you when the sun don't shine and go find it somewhere else.