Generally Asian has bigger buffer of comfortable zone than non-Asian.
Do you noticed that Asian rarely hug or kiss each other, or a.k.a. as Public Display Affection, P.D.A?
O wait... I think a big buffer of comfortable zone is only applicable to conventional generation.
I still remember when the first time an Colombian guy gave me a cheek to cheek greeting. After he left my office, I was laughing uncontrolled. It feels weird, but it was fine.
I am not good with hug greeting, because most of the time I don't know what should I do with the hand on the person's back. Should I pat lightly? Or just put some pressure on the person's back? Or pat with sound 'pok pok'? While hugging, how should I prevent from body (chest) touching?
Isn't that a mere handshake is simple enough?