(also, we lean towards hover parents category - because DS is way too trusting and will go off with anyone who is friendly while DD will do things that scares us to death at times - we just don't apologize - I tend to have the attitude of these are my kids and I will watch them as necessary for safety reasons). If you don't want to explain yourself - just don't. I don't unless they ask me directly, otherwise I just smile and continue with whatever I do.