New York Jets head coach Rex Ryan unloaded on a fan who heckled him at halftime of last night's game against the New England Patriots -- and the expletive-laced exchange was caught on tape.
The Jets were down 13-9 ... and as Ryan walked off the field a fan said, Patriots coach "Bill Belichick is better than you."
Ryan quickly fired back, "Shut the f**k up!"
The fan should've saved his anger ... the Jets lost 37-16. The NFL might fine Rex for his choice of words.