Stallone to Giants Fans: Blasphemous' to Mess with Rocky Statue!!

Yeah, it's messed up ... yeah, it's blasphemous ... but Sylvester Stallone was surprisingly understanding when it came to the NY Giants fan who messed with his famous Rocky statue.

Of course, Stallone knew all about the incident the Philly PD called "a crime against humanity" -- when a NY fan put a Giants jersey on the Philly icon before the Eagles game.

"It was not defaced," Sly said ... "The statue was cold."

You gotta watch the clip ... Stallone's biggest problem with the situation was the garment the Giants fan used to troll Philly -- pretty funny stuff.