Safe to say, Embiid wasn't having it ... he shoved the dude right back.
Embiid -- who's 7 feet tall -- doesn't usually back down against fans who challenge him in sports. He definitely didn't hold back while playing one-on-one with folks 2 summers ago.
Looks like that fire's alive and well off the court, too. We've reached out to the 76ers for comment ... so far, no word back.