That whole tradition thing is so arbitrary. Someone told me a story of when they were in university in Poland, I guess this was in the 50s. A kid comes in to take an exam, oral exam. He stretches out his arm to greet the highly esteemed professor. Who goes completely nuts. "Don't you know that you never reach out to shake the hand of an elder? He's supposed to do it to you, not you to him! What are you, from a farm?" I think his parents actually did live on a farm, but that's beside the point. These customs are just so stupid. Do this but not this. Why? Just because! At least when there's a justification for it (eg. protect from the sun) I can understand it.