The Clippers led 91-76 with 1:10 remaining in the period when Boylen thought that Clippers forward Montrezl Harrell was too aggressive on an offensive foul and started yelling across the other side of the court at Rivers.
Both started arguing near their respective benches when official Jason Phillips assessed the first technical. Boylen and Rivers continued to argue which caused Phillips to assess the second technical and an automatic ejection.
It is the second time Rivers has been ejected this season and the first for Boylen.
Pete Meyers took over for the Bulls and Rex Kalamian for the Clippers.