Can't help but agree.
There is no way to know that the defendant's Zoom screen-name was set intentionally, or even with his knowledge. Prior to showing up on the screen the judge was already leaking bias - "Then we'll bring this...fool in".
While I am inclined to "assume" that it was done intentionally, assumptions is not what the judicial system is about.
"Your name isn't Buttfucker 3000, you yol-hole" along with the initial remark are both incredibly unprofessional (and worrying) things to hear from a person who's literal job is to pass unbiased judgement. Name calling from a judge, really?
Yes, the dude was probably being an ass, but it doesn't matter. The judge judged the guy without concrete evidence and displayed a ton of personal distaste and bias against the defendant over the following minutes. He should asked the defendant to fix his screen name and moved on. This is not the kind of behavior you want to see in a judge who presides over cases of any real meaning.