The Baroda all-rounder was upset by the remarks passed by the young spectator when he was batting at the Reliance Cricket Stadium, where the hosts were playing against Jammu and Kashmir.
According to Snehal Parikh, Secretary of Baroda Cricket Association (BCA), the spectator had been passing "indecent comments" against Pathan as well as other players during the match.
"This youngster had been shouting and passing indecent comments against Pathan and other players, such as Ambati Rayudu, when they were batting. Pathan was in no mood to tolerate such a behaviour. Thus, after he got out, he called that youngster inside the dressing room and allegedly slapped him twice," said Parikh.
According to another BCA Secretary Anshuman Gaekwad, the matter was "amicably resolved" after a family member of the youth came and apologised on his behalf.
Parikh claimed that the match referee will send a report about today's incident to BCCI for further action.