Paul didn't command us to "high-five" everyone but he certainly commanded Christians to "greet one another with a holy kiss" @ Romans 16:16. It's in the Bible, so why don't JW's do this?
My big gripe with JW's when they state that they df because they follow the Bible is you can't find anything that the Bible that resembles their practices. It has been mentioned here by others - but show me private/public reproof in the Bible, show me judicial committees, appeal committees, show me where recordings are prohibited and witnesses not allowed, show me someone that you have to wait a min year to reinstate, show me that when someone is reinstated that they cannot comment at the meetings.
So yes Paul did order the Corinthians to remove the man from among them (in violation to Jesus' instructions, but perhaps Paul didn't know of them). Yet we cannot neglect were he relents in 2 Cor and tells them to restore the man shortly thereafter.