"Women who are participating in candle-light vigils and those who are protesting have no connection with ground reality. These pretty ladies coming out to protest are 'highly dented and painted'," he said in an interview to the ABP news channel in Bengal (Watch). "I have my doubts...how many of these women are students...women in these age groups are generally no longer students." (Comment here)
Mr Mukherjee later offered an apology as his remarks invited severe criticism. "The remarks were regarding whether I thought it was a students' protest. They were not meant to hurt anyone. I apologise unconditionally," he told NDTV.
His sister, Sharmishta, earlier told NDTV, "If he has said this, I apologize on his behalf. As a family, we do not agree with his remarks."
After his father became president of the country, Mr Mukherjee contested his parliamentary seat Jangipur in Bengal and won by a slender margin.
Over the weekend, protests in Delhi turned into violent clashes with the police; a constable trying to control the crowd died of his injuries. President Mukherjee said recently that though public anger is justified, protests should be peaceful.
The student whose case has shocked and angered India was flown on an air-ambulance to Singapore last night. She is reported to be stable at a super-specialty hospital known for its expertise in multi-organ transplant.