Dave Portnoy 's trip to Mississippi was interrupted by a young man yelling an antisemitic phrase at him on the street ... and the tense encounter was captured on video.

The Barstool Sports founder was doing one of his famous pizza reviews at a spot in Mississippi -- he's visiting for Mississippi State's game against the University of Georgia this weekend -- when a passerby yelled "F*** the Jews" at him. X/@LikelyTarnished

Dave's clearly taken aback by the comment ... before telling the guy to come into the camera and show his face to the world. Others in the background also call foul on the unidentified antisemite.

It's hard to hear in the clip, but the Portnoy and his harasser seem to exchange a few words while a bigger dude in a blue shirt separates them ... so, no fisticuffs her

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