If Judge Du's decisions turn on her indignation at "arrogance", she utterly lacks the temperament to adjudicate federal cases with lives, businesses, and public policy at stake.
If she managed herself to a single "fishy oil salesman" remark for "arrogant" lawyers to stew in, but otherwise ruled according to law and facts in the public interest--such a response would have been proportionate. Judge Du failed to do that.