I have nothing against a good natured jab at others. The reason I suggest taking it to private is due to the number of players who may not realize two players know each other and are jabbing each other in fun.
In fact, I get regular complaints about this type of stuff, and, fortunately, I usually already know the players involved and see they are just joking between friends.
People that do not know that perceive it as abuse towards another player.
The system is not perfect and it will never be perfect. In a perfect situation, we would never need moderators as the radio channels would never show abusive behavior.
Eliminate abusive language, you eliminate the moderators. Seems simple enough.