write a  letter to your friend advising him and letting him know how you were disturbed by his/her behaviour when he/she passed a racial remark against your fellow classmates.

Dear Student.
Such questions are made for enhancing the self creative skills and should be tried answering on your own. However, here are a few points that will help you in framing your answer:

• There was a thing I wanted to talk to you about.
• You know Darrel, right? I have seen you picking on him all the time and I thought that it's important that you should know he is not cool with it.
• I know he is African American and you shouldn't highlight that fact in the class. 
• This type of behaviour can traumatise him for his entire life.
• I think it would be better if you apologise to him in the class. We all are friends, right. Please don't do it any more.

We hope that this answer solves your query. Kindly check the format of letter from our website.
Regards.