Donald Trump’s presidential candidacy presents decent people everywhere with a dilemma: Sprayed with an open fire hose of schoolyard insults, locker-room vulgarities and bizarre policy pitches by the presumptive Republican nominee, they must make hard choices. Is this latest comment so outrageous, so much worse than all the others, as to require its own response?

Speak up too often and you risk sounding like a car alarm, so urgent and yet so familiar that residents no longer hear it. But don’t speak up often enough and you risk turning the unacceptable into the unremarkable.

At a rally in San Diego on Friday, Mr. Trump again steered his pirate ship into uncharted waters, firing off personal and racially tinged attacks against a federal judge hearing a case in which Mr. Trump is the defendant.

The judge, Gonzalo Curiel of the Federal District Court in San Diego, is presiding over a class-action lawsuit that accuses Trump University of defrauding and misleading customers who spent $1,500 for three-day seminars that promised to teach Mr. Trump’s secrets of success in real estate. Shortly after Mr. Trump’s rally, Judge Curiel ordered the unsealing of about 1,000 pages of the company’s internal documents. The release, which came in response to a request by The Washington Post, was standard procedure for a civil suit.