Two people agree to meet at seven. One of them is standing outside the restaurant at 6:52, checking the door. The other one is still in the car at 7:04, typing a text that says almost there. Neither of them thinks they did anything wrong. That’s the part that causes the fight. Some of it is personality. The person who is always running late tends to be that way in every decade of their life, and no amount of generational sorting explains them. B…