Cam -- who helped sponsor teams at the event -- responded by telling the kid he was "rich" and asking to see his parents.
The clip quickly went viral ... with several current and former NFL players chastising the player for going after Cam.
Leonard Fournette -- a newly crowned Super Bowl champion -- wrote on Twitter, "Any young athlete watching this video please don’t be this kid."
"Don’t miss your chance to learn something from someone who has been their at the highest level in this sport.... STAY HUMBLE."
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Cam himself later commented on the drama ... explaining his role in the situation and adding he does everything he can to help kids at events like these.
Late Sunday night, the player -- identified as Perkiomen Valley HS's Jseth Owens -- issued a statement apologizing for the way everything went down.
"I did not intend for it to get as far as it did!" said Owens, a junior linebacker and wide receiver. "As a football player, I let my competitive side get the best of me & it was a huge miscommunication."