Jets Fans Troll Patriots Practice -- YOU'RE ALL CHEATERS!!!

Leave it to the NY Jets fans to throw salt in the Patriots wounds -- trolling the team by flying a "CHEATERS" banner over the New England practice today.

The sign, created by Jets Fan Media, read ... "Cheaters Look Up."

Don't worry, Pats Nation is already firing back on the Jets Fan Media twitter page -- one guy wrote back, "The only banner Jets fans will see for a long time."