Thompson was ejected after shoving a ball in Draymond Green's face in Game 1.
A skirmish broke out during overtime in Game 1 after Tristan Thompson was called for a flagrant foul two on Shaun Livingston.
Cleveland was down 122-114 with 2.6 seconds left in overtime when Livingston missed a mid-range jump shot. Thompson didn't appreciate the attempted shot and was seen directing his elbow in Livingston's direction.
Thompson was called for a flagrant foul two and seemed confused by the ejection.
The Warriors had words with Thompson, who shoved the ball in Draymond Green's face. A skirmish broke out as both teams were angry.
After the game, Thompson told reporters why he was upset with Livingston.
"Maybe he was trying to increase his points per game. I don't know," Thompson said. "That was some bullshit, but I just needed to contest."
The Warriors beat the Cavaliers 124-114.