coach yells at opponent

[Bart Tyson]

college womens, i'm trail a few feet from the coach. His player is holding the ball. The girl guarding his player is in front of her. The coach is standing on sideline right next to them. All of a sudden he yells (real loud) "get your hands off", and the def. player puts her hand down. This all happened quickly. His player gets the ball, the def. player puts her hand( or fore arm ) on her and he yells. The ball gets passed. Now i'm next to him and i say coach she can do that. He didn't like that answer. Yells at me saying she can't, not when she is holding the ball. So i drop it until another trip when i'm standing next to him. I let him know the def. can measure up. Question, is the coach allowed to yell at the opponent?