The Patidar leader also that Modi has used foul language against former Prime Minister Rajiv Gandhi.
The incident happened earlier in the day when Hardik was addressing a gathering at the Jan Akrosh Sabha.
Tarun Gajjar had said that he had his own grievances with Hardik, for disrupting normal life in Gujarat during the Patidar agitation, which caused him to go through a great deal of hardship.
As soon as Hardik Patel started his speech at Baldana village under Wadhwan taluka, a man suddenly came on the stage and slapped him.
Hardik's helicopter ride to Lunawada to address an election rally got into trouble after a farmer, Vinay Patel, went back on his permission to allow the chopper to land on his private field.
Jadeja's father, Anirudhsinh, and sister, Nainaba, joined the Congress at an election rally in Kalavad city of Jamnagar district.
Alpesh, who had joined the Congress party in 2017 ahead of last Gujarat Assembly polls, barely after 18 months tendered his resignations from all party posts on Wednesday evening.
Barely 18 months after joining the Congress party in 2017 ahead of the Gujarat Assembly polls, Thakor tendered his resignation from all party posts on Wednesday.
Hardik Patel alleged that the BJP of trying to win the elections through 'money power'.
The bench also comprising Justices M M Shantanagoudar and Navin Sinha told the counsel appearing for Patel that there was no urgency in hearing the matter.
Patel, in his petition, stated that the apex court should urgently hear his petition because the last date and filing of the nomination papers for Lok Sabha elections 2019, is April 04.
Hardik Patel can't contest Lok Sabha election as Gujarat HC rejects plea to stay conviction in riot case
A local court in 2018 had held Hardik, and two other leaders guilty for an attack on the office of a local BJP MLA in Visnagar town, during a pro-quota Patidar rally in 2015.
The sessions court had awarded him two-year jail term in the 2015 case, which is linked to the Patidar quota agitation led by the 25-year-old leader.
The Patidar leader was convicted in July last year by the Visnagar sessions court in Mehsana district in a case of rioting connected to the Patidar quota stir that took place in 2015.
'Main Bhi Chowkidar hoon' narrative was launched by Prime Minister Narendra Modi to counter Opposition's oft-repeated jibe, "Chowkidar chor hai", aimed at him.