Simply put, these parents would not last three weeks at my daycare. Attitudes like these parents have, would be grounds for termination.
As far as pick ups, do you have a late fee? I have it in my contract that after 2 late pickups with no good reason, it will lead to termination the third time. I would not put up with this obvious disrespect at all. If you sign a contract agreeing to policies, you follow them or you're out.
If I were you, I would have a serious talk with them and if they still don't smarten up, I would terminate.