Given the laundry list of things people hate Bannon for, this is just another line item. Bannon's major issue beyond what people here consider the obvious is his near fanatical desire to deconstruct the Right and eliminate the Left altogether. That sort of fanaticism is what will continue to lead him down such obviously bad choices for backing.
Bannon isn't retarded. Even if his goal was as nefariously supremacist as people here love to claim, he knows full well that won't happen on any grand scale so advocating for such is a waste of resources. Right now, he's fighting his own little war on two fronts.