What should you say when someone says you stink at a sport?

I just say to them Nobodys perfect Jeez! But I hate sports I just play because I have to in gym! Everybody is so competitive!

Either that, or you can look at it this way:

You have 3 choices.

Choice 1: Get upset.

Choice 2: Say, as kindly as you can, but unencouraging enough for them to not continue with the subject, "Thanks for your input, I'll consider it, but since I like playing this I'll be the best I can be."

Choice 3: Say (kindly), "I do what I like doing and you do your thing."

Basically, you have several choices I guess. Pick one!