Im just want to talk about my friend

My name is Kyuhwan Jung, and I'm student of ELI, in Springfield,Missouristate. I have been studying in here for about 4 months. I really respect about U.S government and the president of this country. But today, i felt some unfair situations in downtown. It is not about me, it's about my friend whose name is Eric. I want to talk about RACISM.
Today is my friend Eric's birthday. First of all, my friend Eric is black. He wore the green polo pk shirt, and it is not that long. We enjoyed in club and he wanted to move to another club. It;s name Zan. The guard of the Zan told him he couldn't enter the club, cause his shirt is long. Actually I have a picture of his shirt and it is not long, even some white guys wore longer than this, they were in the Zan. I think it is unfair.