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I'm baffled at how millennia old* rituals involved with no-longer-being-strangers are lost on some commenters

Seems to me that the ubiquity of such greetings across all cultures would imply that you're the exception here, no?

A lot of cultures bow rather than shake hands.

Other cultures require you to get a lot closer than a handshake.

When you don't want them to remain strangers.