I don't think I would let it would bother me. I actually try to always act as if a parent is right there next to me which I think helps me to stay accountable. I try to live like this as well e.g. don't say something about someone you wouldn't say to their face etc.
I used to peek at my daughter when she went to a daycare centre so i could see her interact with the other kids. I told the staff though that I was not spying on them but rather watching my kid have fun without me.