If its racist, then its not sledging. Thats really just being a weak ....! If its you saying something about someones mum or nan, or family member thats died, then again - its just you being a weak ....! Thats bullying.
However, if its a motivational comment bagging the f out of someones sporting ability IMHO thats different. Cos they (if they've truely got any sporting ability) can take your thoughts on board, and belt you six rows back into the stands, and then have bragging rights over your bowling. This is not bullying.
Besides, in team sports such p1sstaking can have an opposite to the desired effect when it works as a motivator to the person/team being sprayed. There's no better feeling sticking it up em, and letting them know it when just desserts are served.
If you want to sledge or niggle, roll the dice. Just dont sook when your number doesn't come up.
Its just not sport (team sport anyway).
There should be some respectable boundaries. Unfortunately there'll always be some flog who ruins it for everyone else by going too far.
BUT, its Cricket NOT
ps - was it a Pom that whinged about this?? If so, hence the name!