The latest incident of alleged moral policing was reported from Ulhasnagar area of neighbouring Thane district.
The video, which went viral on social media platforms yesterday, shows the officer, who was accompanied by a constable, beating the youth after asking him a few questions.
The man in uniform is also seen abusing the youth's female friend when she tried to intervene. The duo was sitting in an auto when the police officer approached them.
It is not known who shot the video or when the incident took place.
In August, police had rounded up 13 couples and 35 others following raids at hotels and a beach here allegedly for indecent behaviour in public.
The action, which sparked an outrage in social media circles, had led to criticism that police was indulging in moral policing.