When did LGWare express a dislike of anyone on the basis of their race?

Indeed, the whole point of the article is that he's not dismissing his students as worthless or a lost cause or anything if they display behaviors that anyone ought reasonably categorize as (perhaps only mildly) racist.

Even if LGWare occasionally ascribed to racism something said without racist intent--everyone makes mistakes, so it's possible--the point is that he isn't condemning them because of their race. He's hoping to help them with their behavior and attitudes. "Give them the grace to grow," he says.

Did you even read the article?