Phoenix Suns superstar Kevin Durant had a pregame exchange with two fans ahead of Thursday night's game ... confronting the Mavericks supporters after being called a "bitch."
The whole exchange was captured on video ... showing KD running out of the tunnel for warmups -- but coming to a screeching halt after hearing the word hurled his way.
Durant quickly approached the two fans -- who appeared to have great seats for the game -- and they went back and forth for a good 30 seconds before the two-time NBA champ waved his hand in disgust and rejoined his teammates.