If there is something I don't understand about this then please educate me.
This ad features justice Ginsberg selling anti-Trump T-Shirts
https://jametees.com/ruth-bader-gin...D5KrZ6AIVi4bACh23FgRZEAQYASABEgLmAPD_BwE1) A judge, especially a supreme court justice, should be fair and impartial. Even just the appearance of being fair and impartial is important to the legitimacy of the court.
2) Using a Federal position to promote a product, entertainment, or personal political advocacy, looks a lot like a conflict of interest and using the position for personal gain or personal purposes.
3) Even if not for the ethical, moral, legal implications, a high court justice selling T-Shirts is just a trailer trash thing to do.