Yelling by players...when is it unsportsmanlike?

[mlancast]

I can't think of any ruling against distracting a shooter except during a free throw. I'd have a tough time calling an unsportsmanlike "T" for what I read here. Only if there is some taunting/baiting.....
I think you did the right thing by just asking the players not to do what they were doing. This could easily prevent bigger problems later in the game.