Maybe they’ll feel terribly guilty, someday, about being so self-absorbed ... and then they’ll start being pleasant to people.
Hmm, well, I wish you the best of luck. I think my own epiphany in that regard came when I was 17 and a very large feller in green inquired very loudly who cleaned the toilet and folded my clothes for me before I came to Boot Camp and I replied that it was my Mom and he replied even more loudly, "Well, yer Mom's
NOT HERE, IS SHE?!??"
We guys catch on to subtle suggestions like that... ;-)