Somewhat different western social customs?

In many middle eastern nations, it is considered complimentary to the meal to issue a good loud healthy belch thereafter. Using that as a go-by, what western manners might be altered / different so that conduct in (what passes for these days) polite society would be different, and how so?
 
How about instead of whistling when you see an attractive woman go by.....it was obligatory to squeeze them on one of their posterior cheeks as a sign of attraction?:D Of course, for them they would be (ahem), "reared" to think that this was considered normal behavior and they then would not be inclined to slap a man in the face but instead would just smile and take it as a nice compliment. Just my 2 cents. P.S. No,..this is not something that I do or wish that I could get away with.
 
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