In the video of the April 8 incident, which has gone viral on social media, MNS workers are seen entering the residence of the man in Ghatkopar (East) and beating him in front of his family members.
The party has also posted the video on its official Facebook page.
The clip also shows MNS workers abusing the man, who appears to be in his late 30, for posting derogatory comments against Thackeray, and forcing him to seek pardon from the people of Maharashtra, the party and its president.
The man was also forced to do sit-ups.
The party said the man was taken to Pantnagar police station, where a non-cognisable offence was registered.
"If anybody speaks bad about the MNS chief, we are ready to thrash him by entering his residence," the MNS posted on its Facebook page.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)