I think sledge is ok,
Clearly not if your all just turning up for a game at a low level, thats pointless and not needed.
There is banter, which is fun, then there is sledging. Banter is not sledging
If Fattus turns up at the crease, and I said, "Don't worry, Fattus we've got every one to park their cars on the offside this week, there windows are safe" - , then that's banter.
If I say that the bowler is going to knock your Fu@~k teeth out, and why the f@ck are you batting at 6?, then thats sledging.
Sledging is fine, if like everything else it don't right. Like others have said, don't do it if you're rubbish, don't do it if every ones just turning up for a game and a fun day. don't do it if the guy your sledging is on 200, or a legend, or whatever... Don't make it personal, or out of line.
But if you think you can say something to upset a batsman or bowler then its fair game.
Saying that you dont like it and there for it should not be part of the game is a none augment. I not like left armers - ban them!

P.S
You're all (No Swearing Please) at posting on the internet