How would you as a teacher challenge discrimination in school?

Are you willing to expand your act-space in order to challenge this issue? Would you go against the norms of the institutions/outer forces? knowing the consequences how far would you go?

 When I was in elementary school I was discriminated because I was more fat. Seeing this scenario the teacher never did anything to help, maybe because he thought that it wasn`t his business.  I believe that the social learning are important, so they should make part of the classroom formal curriculum.  The solution could be , for example, give one hour every week to the children talk about what happened in the week and find the best way to overcome the problems.  Of course, if the problem was urgent or I presented the act of discrimination I would intervene. The objective of this weekly reunions is to show them that they are safe and they can express what they feel.
I would go against the norms of the institution if I was, for example, in France where they don`t let woman use a scarf in the head.  Of course I wouldn`t want to go to prison, because the police don`t let women use the scarf.  Actually, I am a very practical person, so in last case, I would just send the massage that I respect other`s people cultures through the hidden curriculum. 
I would show them that it doesn`t matter where you from, because to reach you`re dreams you just have to be willing to learn and to work in what you want, sometimes you will need a little luck, but that doesn`t mean that is not possible to decrease discrimination. If we look back in the history, indian and african people were severely discriminated, they couldn`t even go to the same bathroom, sit in the bus, etc. After the speech of Martin Luther King , Jr. "I have a dream...".. a lot of things changed. Even though he was murdered the rights of africans were improved.
If you want to start something big, you have to take risk, do something that never have been done or that few people did, pass trough the barriers of conformism and make a difference...someone is going to remember you in the future.