I think the overall reason is a feeling of self-importance. Who am I, that I have to tell you what I’m doing? You should be moving for me! You are less important than I am, so step aside! I had this happen the other day. This lady’s kids (like 6 of ‘em) were all over the aisle, and racing hither and tither. I’m trying to get through, the kid runs into me, and the mother says to me, “Oh i guess you forgot to say excuse me.” ME?! your little retarded spawn did, breeder! </rant> People are just plain rude these days. This is the same reason no one uses indicators to change lanes anymore.