I think Trump's comments about the judge are reasonable given human nature.  The comment was not racist as the claim of conflict of interest relates not to race but personal interests and background.  When John Kennedy was pursuing the Presidency, there was anti-Kennedy talk based on his Catholicism.  He was going to turn the US into the Pope's servant.  When people don't like someone, in this case Trump, they will seek out any pretext to attack them.  Judge's do have personal backgrounds and those backgrounds do influence their rulings.  Everybody knows that personal preference influences decisions.  This is one of the reasons that there are appeal processes.  What is admirable about Trump is that he will say what everyone knows but won't say because it is not politically correct.