"Amitabhji sharing the stage with Raj Thackeray is an insult to millions of north Indians," Azmi told reporters here.
Sinking their five-year-old differences, Bachchan yesterday shared dais with Thackeray, who said whatever happened between him and the actor was a thing of the past.
They had come together at the seventh anniversary of his party's movie industry wing Maharashtra Navnirman Chitrapat Karmachari Sena (MNCKS) at the Shanmukhanand Hall in Central Mumbai.
Azmi, who is also the state chief of Samajwadi Party, added that he was "pained" to see the iconic actor with the politician, who had launched a tirade against the north Indians.
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He said the actor should now clarify whether Thackeray has accepted only him or all the people from north India.
"Amitabhji should have asked the MNS chief to let go the hatred he has towards north Indians and also asked him to apologise to the north Indians," the SP leader said.
"Raj has been playing politics and has been fooling the Marathi-speakers dividing the country on regional lines," he alleged.
Meanwhile, the Congress also criticised the MNS leader over his "double standards".
"Finally Raj Thackeray realised his mistake. He has adopted double standard approach to win votes," Maharashtra Pradesh Congress Committee spokesperson Sachin Sawant said here today.
Later, the MNS had also targetted Jaya Bachchan after she had said at a public function that being from Uttar Pradesh, she would prefer to speak in Hindi instead of Marathi.