I always try to let others no that my cooking isn't the only valid cooking on the planet, and that I make my share of mistakes too. But as was previously stated, there are many families where honest cooking is practiced in the home. We who do it are considered a rarity.
When someone comes to me and tries to put me on a pedestal, I shrug it off and try to teach them something about humility, my humility. Now if I'm over at someone else's home, and teh food we've eaten just doesn't measure up, if they like it, I like it. If they want to know how to improve it, then If I know how to improve it, and asked, I will offer advice and suggestion. And ceratainly, especially when the difference is solely about flavorings, I try to let people know that everyone has different tastes, and that just because I like my tomato sauce with a bit more sweet basil, that doesn't mean that they can't like more oregano. Our favorite flavors are just different, without either version being better, just different.
However, to those who use baking soda to flavor and tenderize a good piece of beef, I try to teach them a better way. That's just plain wrong.
Just remember to be gracious and understand that they are paying you a compliment and acknowledging your skill and talent. Let them know they have talent as well, and that there is nothing you do that they couldn't.
Seeeeeya; Goodweed of the North