Not to a dinner party, or on the odd occasion, but everyday??? I always see the same people drifting into school late without a care in the world. It drives me potty! I used to be a teacher and found it very disruptive when you are trying to get the day started. It can't be setting a very good work ethic to the child.
I personally think lateness is utter rudeness and arrogance. "I am more important than you, so you can wait for me"