Here's the deal ... MJ is the principal owner of the Charlotte Hornets and Monk got a really stupid technical foul that coulda cost the team the game.
So, MJ reached back like a dad upset with his kid and whacked the 20-year-old in the back of the head ... in front of everyone!!!!
Backstory ... the Hornets were tied with the Pistons in the final seconds of Wednesday night's contest ... when Charlotte's Jeremy Lamb knocked down a deep 2-pointer to go up 108-106. The Hornets bench went wild ... and Monk ran on the court to celebrate.