The incident occurred when Ganesh Sahane, who was passing by the road near a renowned college, noticed a man and his female friend kissing each other.
According to police, when Mr Sahane objected to their act, the accused, identified as Monty, abused Sahane and beat him up with the help of five of his friends.
During the scuffle, Monty allegedly stabbed Sahane with a glass of a broken bottle, police said.
Police managed to catch hold of one of the five persons who were involved in attacking Mr Sahane, an official said.
A case is being registered by police.
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