what to say to nit pickers at car shows

That's an awesome looking ride.

For someone to make a smart *** comment like that especially at such a bas *** looking ride, he deserved everything Pop's threw at him.

Man, I will go out of my way to compliment someone's car at a show even if something is not to my liking, especially if someone is next to me making stupid criticisms.
It just pays to be polite ya know.