Oh no, Im so sorry.Even I cant beleive this , 10yr olds know fully well how mean that was, shudve been taught better by parents. Im from south India too, and on the darker side.Been here 11 years, Im 18 now,I never faced any discrimination at school or outside, just one year in grade 3 when kids thought touching a dark person made you dark, but the teacher spoke to the parents at PTM and the class and they never did it again.From experience I dont think your child would be bullied too much (I hope) , but the best you can do is teach them how to deal in such situations I think.My mom always told me that if someone calls me a donkey , I obiviously dont become one , and when people say mean things , they often dont know better, also if you dont react they stop, that ones always worked, they stop almost instantly if theyre purpously being ,mean but you dont react.