Racism :/

I don’t know how people become racist and I don’t know how it makes them feel good. So, Today at school I experienced racism and its horrible. I’ve experience its so many times. I always try to find a way to say something back, but I just can’t. I’m too afraid. I don’t know what to do and I’m pretty exhausted with it. If anyone could give me any ideas on what to do or what to say or just something to help, please. I just want to say something back to them that they’ll stop like forever or for awhile at least. so no one else would go through this pain. :( I’m just done and it ain’t even funny. :/