Watch: Celtics fans chant 'F--- you J.R.' after cheap shot against Al Horford
Maddie Meyer / Getty Images Sport / Getty

Boston Celtics fans were rightfully furious with Cleveland Cavaliers shooting guard J.R. Smith after he gave a dirty foul by pushing Al Horford in the back while he was airborne.

Smith received a flagrant-1 on the play and an additional technical foul after being confronted by Marcus Smart.

He was also treated to an obscene chant from Celtics fans.

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Watch: Celtics fans chant 'F--- you J.R.' after cheap shot against Al Horford
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