I agree! There won't ever be anyone who will do everything exactly the same as you. I am more strict than my daycare parents. I see how the kids become defiant and mouthy to their parents. They know they are never allowed to speak to me that way. I don't allow tantrums, bad behaviour, talking back etc. That doesn't mean it doesn't happen but they know that they will have consequences to their actions.
I quit worrying about telling the parents about these type of things. Obviously the parents let their child away with it at home and that is why they do it. I also am tired of excuses for the behaviour. I will only tell a parent if the behaviour has been bad enough to get a timeout.