Not surprisingly, the blond kids didnt like being treated differently,
however almost none of the other kids complained or raised the issue of unfairness to the other kids.

This tells us about one aspect of human nature - and perhaps tells us nothing that is not already clear. I don't think that tell us much about racism/sexism etc etc - which are all manifestations of this basic aspect of human nature. Which is usually us taking the easy option, which is so tempting to take.

But is should be some consolation that there is a an aspect of human nature that leads some human beings to act selflessly and positively and caring equally for and and working with all colours and creeds.

This will always be an less easy option for those of us with busy lives and ambitions - but hopefully it will always remain an option for all of us?