Been at the park for all of 5 minutes. Hardly anyone here, just 2 other kids. DS has been of the seesaw with me bouncing him - another girl and her dad approach, and I get off and say, "Look, DS, this little girl wants to go on with you."
At which point, the dad immediately says, to hos DD, "are you sure you want to on that, the boy is VERY bouncy..." 
DS immediately gets off and moves to the slide and climbs up it - he knows he's not allowed to do this, but there's no-one on it, so I remind him for next time but let him get on with. dad and daughter hot on our heels following from seesaw, at which point the dad says, "use the proper way to go up the slide and go to the stairs - don't climb up it"

So within a few minutes of being here, I already feel like DS is some kind of destructive, badly behaved hooligan bringing the tone of the park down.
AIBU to expect to just be able to have a nice time without the parenting police passing comment every 5 seconds??