People getting defensive at car shows!

The people at normal car shows just ruin it for me.
(not cruise nights or charity shows, for some reason everyone is happier and less cynical at those.)
I went to a cruise night at a local burger spot that happens once a month. Nothing too big, around 25 cars. I set up with my little slant 6 survivor and just start enjoying the show. Since I am the youngest guy there, wouldn't you know it; EVERYONE IS AN EXPERT all of a sudden. Most of the guys there were nice and liked my plans and what I had done, but at least 25% of them were just ripping me a new one over every little detail.
However, the next morning I went to another show. (formal judged type one) and the same thing happened. but this time EVERYONE IS A EXPERT. (over 90%) EVERYONE I talked to except three told me I was a.) doing something wrong b.) going to my dad and asking him questions about the car, (which is a honest mistake,) then when I started to answer their questions, they got all pissed and tried to talk over me!

All but three.

People are douchebags all over. I feel bad for young folks they arent there yet with their own douche-baggery...:)