I'm saying that you should exchange a "Sign of Peace" in some way (handshake, smile, whatever.... Purposely standing a pew away from someone at Mass, just so you do not have to greet them, seems to me to be doing the exact of what Christ would do or commanded.
Seems to me that you're constructing moral laws from rather thin gruel.
But just to make you feel better about me, I DO smile, now and then, selectively, at certain people--like my wife and children.
Now and then, a stranger--just so I can maintain the adjective "Christian"--you know, for show.
Greeting people isn't the issue it's the placement during the Sacrifice of the Mass. Putting it right after the Consecration tends to make the congregation think about themselves and; what seems like to conservatives, a veiled attempt to reduce contemplation of the Almighty which has become present to the congregation on the altar. It has nothing what so ever to do with greeting or not greeting our fellow Christians. Logically that should be at the beginning of the Mass. We are wary of this ceremonialistic greeting because, although it is good to have your friends and family in your prayers and to think about them, especially during the Mass, it is too easy for these formalisms to descend into a kind of egotistical trip when placed so close to the Consecration. At that point in the Mass we are suppose to be greeting God both in our hearts and collectively as the congregation.