How should people refute your food when they say it tastes bad?

If someone tells you that your food is not delicious after eating what you brought, you can reply to the other person that you think it is not delicious. It's really a pity! Maybe this kind of thing doesn't suit your taste. These things are very famous in our hometown. It is one of the best local specialty products. I don't think it's polite behavior, or don't eat it. Even if it tastes bad, you should keep it in your heart silently, which makes people feel disgusted and embarrassed, and you are not pleasing yourself. What do others think of you? I think the quality is really poor. It's better to deal less with this person in the future and stay away from him.