Justice is blind bigoted.
I don't know this judge's history, so I may be off base, but I'm going to defend her on this one. Our current practice of jury selection is a theater of the absurd. It has become the most important phase of the trial, as attorneys look for anything that may indicate a predisposition towards their opponent's point of view. We have gotten statistical correlation down pretty fine, so this actually works. Note - I am saying that this practice actually works the way lawyers think it does.
Ethnicity does have a fairly strong correlation with a number of views that come up in trials, and so lawyers routinely strike specific ethnicities while trying to claim their rationale is race-neutral. If the judge is trying to stop that practice, more power to her.
I'd prefer a system in which lawyers cannot strike people - just select the jury by lot, and go from there.
Drew Garrett