yay, I've confused the American's again!!
Baiting - goading, verbally (or occasionally physically) provoking someone. Is similar to trash-talk. Comes from baiting a fish, ie encouraging the fish to take the bait, and then end up on the hook.
My interpretation of the rules on yelling etc at a shooter is this: yelling "shot" (or any varient) so as to advise your teamates is OK. I prefer players to do this after the ball has left the shooters hand - then there can be no room for complaint from the offence. I
do not tolerate yelling in a shooters face (or screaming) or clapping at a shooter (especially behind a player on a lay-up - something that quiet a few players in the rec leagues here do). In any case, I always warn the player first (one warning applies to all players on or off the court) and am more than happy to explain my feelings about this type of behaviour to the players and coaches.