Why is it OK to be racist against white people?

I ask this because of an article I saw in the new york post. Basically an off campus school housing at UC Berkley is basically saying no white people allowed in common areas and the like.

A section of the article

An off-campus housing co-op for University of California, Berkeley students bans white people from entering common spaces to “avoid white violence” — sparking criticism that the policy inflames racial tensions.

The five-story, 30-room “Person of Color Theme House” near the school requires students to declare their race when signing in and to announce when they’re bringing white guests in to the building, according to house rules leaked.

Why is the left constantly trying to bring back segregation?

nypost.com/.../
Why is it OK to be racist against white people?
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It should be noted that it's the housing co-op doing this, the university, while didn't create the policy, backs the policy. Regardless, it's a violation of the civil rights act.
Why is it OK to be racist against white people?
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