People do miss the point of Trump’s remark.
He isn’t making a racist remark. He is accusing the judge of racism and bias.
Right or wrong, this is the charge. With the judge’s background, its not hard to imagine.
There used to be a minor cabinet member up here many, many years ago who used to commit verbal gaff after verbal gaff. He was constantly raked over the coals by the press- this was long before the advent of cable news and the 24x7 news cycle - and he was finally reduced to pleading that the press should print what he meant and not what he said.
I think everyone knows what Trump meant, but what he said came out different and instead of clarifying he kept doubling down until it's reached the point that all he can do is what he's done - say he isn't going to talk about it anymore. Of course then he continues to talk about it.
What might help is if Trump gives some specifics on the rulings that he feels were wrong or unfair and then has recognized legal experts talk about them and explain why Trump is right. That's evidence that it was never about ethnicity.