Let me clarify, then. If they did not exchange some sort of sportsmanship that would be wrong. Shaking hands is a personal exchange between two individuals. If I don't take my hat off should I be concerned that there are some strangers looking at me in disgust? In the big picture it really is not that important. I dont go out of my way to offend anyone on purpose. But there are some things that are generational and may never be agreed upon. So I tip my hat to all of you who would require that and shake hands when I should with the rest of you.