"The caste system makes it easier for people to accept other forms of exclusion," he explains.
There might also be what he calls "psychological compensation" at play for those Indians who experience prejudice as members of lower castes or the so-called "other backward classes".
"They could feel better by looking at African people and thinking 'at least I am better than that'," he says.
https://www.independent.co.uk/news/world/asia/nigerian-student-mob-beat-up-racist-attack-northern-india-greater-noida-cannibalism-drug-use-accuse-a7656566.html
.
https://www.aljazeera.com/indepth/features/2016/06/african-india-demons-160620101135164.html
But if this happened in Europe the UN would be screaming like little girls.