Couldn't agree more with previous 2 posts.
I have 3 children, one of whom is a boy with ADHD.
He can sometimes be impossible to deal with when we're out at the park etc.
But you really can't spend time worrying about what other parents think - it may well that they have a perfect little family with no "little problems" but for most of us with boisterous little monkeys, it's just not like that!
Ignore them - it's their problem/hang-up, not yours!