All the same, the Israeli bomb threat hoax does force some reassessment. Perhaps we have given Trump-era anti-Semitism more emphasis than it deserves. This does not mean that, as Mr. Spicer suggests, we should see the president as the victim of unjust insinuations. Instead, we should ask why there was so much more pressure on Mr. Trump to speak out about apparent anti-Semitic threats than about other types of religious and ethnic violence.

For example, while synagogues have been threatened, at least four mosques have been burned. According to the Council on American-Islamic Relations, there have been 35 attacks on mosques — including vandalism, break-ins and death threats — in the first three months of this year, compared with 19 over the same period in 2016. In the last week, a family of Pakistani origin in Virginia and an Iranian refugee in Oregon reported their homes broken into and defaced with anti-Muslim obscenities.

The Iranian was not even Muslim, and others who are not Muslim but may be suspected of being such have been targeted in hate crime incidents. In February, a white man demanded to know if two Indian patrons at a bar in Kansas were in the country illegally, and shot them, killing one. In March, a masked assailant shot a Sikh man in Washington State, reportedly telling him to go back to his country.

The various strands of renascent bigotry in Mr. Trump’s America are intertwined, and anti-Semitism is only part of the tapestry. Yet Americans, for good historical reasons, tend to have a particularly heightened sensitivity toward anti-Semitism. All 100 senators signed a letter calling on the Trump administration to take “swift action” against the anti-Semitic bomb threats. There has been no similar political urgency in demanding protection for other harassed minorities.

The president and his associates mix anti-Semitic dog whistles with frank attacks on Muslims, immigrants and refugees. The paradox is that in today’s America, coded anti-Semitism is more of a political taboo than open Islamophobia. We spend a great deal of time and energy parsing the semiotics of Mr. Trump’s role in stoking anti-Jewish sentiment, while Muslims and immigrants can be defamed with impunity. The risk here is that we’ve been distracted by the anti-Semitism controversy from the ways in which other groups are being demonized as Jews once were.