"The Sikh community has contributed a lot to the development of those countries where they have settled, and especially to Britain, where Sikhs are present in fairly large numbers for over a century," Tewari said, when asked for a reaction to the incident.
"Racial behaviour is completely intolerable," Tewari said, adding that if the British government did not act against the guilty person, a "very negative signal (would go out) to not just that community but other minorities too".
Authorities in Britain have arrested a 19-year-old girl for the violent assault on the Sikh man, which left him with a bloodied nose and a black eye.
Video footage of the attack has been circulating on social media and the woman's actions have attracted criticism.
READ: Hate crime: British teen assaults Sikh man