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Zachary Levi felt a grown man seeking his autograph got a little too up close and personal ... so he told him to beat it.

The "Shazam!" star arrived at LAX Thursday night to a swarm of fans and graphers wanting him to sign their merch. Levi was happy to oblige ... except for the guy in sunglasses shoving a photo in his face.

Check out the clip -- the DC Comics superhero argues with the bearded man about his intentions ... then scolds him for pushing people around. The autograph hound disagrees on both accounts.

Zachary also appears to deny a fan a selfie before hopping in his getaway ride, but it's a lot more friendly.

Unclear how many of these fans said the magic word ... "please."