Barnes was ejected with 56 seconds left in the third quarter of a 120-116 overtime win over the Minnesota Timberwolves on Sunday night.
Timberwolves forward Kevin Love was driving to the basket and Barnes fouled him hard. The officials upgraded the foul from a flagrant 1 to a flagrant 2 and ejected him.
"They wouldn't give me an explanation," Clippers head coach Doc Rivers said. "First of all, it wasn't a flagrant 2. I didn't think it was a flagrant 1. He got mostly ball and he swung at it. My only problem with the way that was done, Blake's should have been looked at."