Talk about an overreaction -- James Harden reached out and smacked the crap out of a Jazz fan's cell phone Wednesday all over some harmless heckling ... and the cops were involved.
But get this ... despite the fact the fan was on the receiving end of the smack, the cops treated HIM like the bad guy and scolded him for talking trash at a basketball game.
So, what was the heckle that sent Harden over the edge?
"You're still the worst flopper in the NBA."
The fan was behind a barricade at the time of the incident and posed no physical threat to Harden.