I mean, you’re “allowed” to do many things if you don’t care about the consequences. Trump right now can criticize the judge as much as he wants - so long as he’s willing to suffer contempt of court rulings.

You’re right, though. Judges are being lenient on Trump with regard to his outside courtroom behavior due to his being a political figure. If you or I did what he has been doing, we’d be found in contempt of court ASAP.