I moved a few years ago.
Partying in and of itself is fine, but schmoozing with someone you just sided with immediately after the case ends is a bad look.
Anyway reading up on the expression's application in the law world, its applied in almost every state as at the very least an acceptable secondary reason for dismissal from a case. It was codified almost 50 years ago. Looks like its mostly used to apply to when a lawyer is involved in a case against an ex-employer, but that's not the extent of its usage. It's not in use as the sole reason for disciplinary action so much anymore because it's generally deemed too vague. Its use as applied to judges seems to be a bit more strictly applied.
So yeah even though it may not get you fired, the idea of not looking like you're doing something wrong so as to uphold the public's view of the judicial process was and still is mentioned in the your profession's guidelines as something to be avoided.
If this had happened
during the time this matter was pending before the judge, you would be right. Otherwise, you get into the issue of having the judge adhere to some sort of undefinable time frame of when they can be seen with someone who was before their bench.
We have this guy earlier saying a judge should wait a month before interacting with those before him:
Ruling was the correct ruling, but this is still a bad look. At least wait a month or something lol.
Would a month be fine with you? Maybe it would be, maybe it wouldn't be. Maybe there are members of the public who would be upset at them socializing after a year or EVER socializing at all. Should the judge be beholden to their interpretation of "appearance of impropriety"? My point is that once you move past the bright line of "is this person before the judge's bench" then there is a high likelihood that someone, somewhere will find the interaction improper. While the canons of ethics for federal judges speak to how a judge "should act at all times
in a manner that promotes public confidence in the integrity and impartiality of the judiciary," a particular judge's adherence to this canon is judged not by the public, but by his fellow judges, all of whom have been in similar situations and will ... judge that judge's behavior accordingly.
There was nothing improper about this under the ethical canons which guide federal judges.