The NBA fined Kenny Atkinson $25,000 following his ejection in the Brooklyn Nets 114-106 loss against the Indiana Pacers.
The league said he was fined for "verbally abusing game officials and failing to leave the court in a timely manner".
The ejection occurred following a non-foul call with the Nets down by 5 points with 1:09 left in the game.
"We've just got to be mentally stronger, and I've got to be mentally stronger, fighting through those situations. Just frustration on my part. I have to coach myself. I don't love that scene out there. That's not what I'm there for. I'm not here to make a show. So I apologize for that. That's not who I am," said Atkinson.