Count last week’s raucous town hall in Queens as another step in Mayor Bill de Blasio’s political decline.

It’s not just that his remarks met with repeated boos: It’s the wide range of topics that produced those jeers as angry and frightened residents packed JHS 190 in Forest Hills to complain about crime, homelessness, bail reform and schools Chancellor Richard Carranza. This was an isolated mayor besieged by citizens furious at the results of his governance.

As The Post’s Julia Marsh reported, the three-hour forum saw the crowd calling him a liar and his responses “bulls - – t.”

Bizarrely, he even made needless trouble for himself: When one resident told him that the no-bail reform is turning New York into crime city, he responded by calling the link between rising crime and bail reform “right-wing propaganda.”

Huh? He himself made the same connection two weeks ago: “It sort of stands out like a sore thumb that this [no-bail law] is the single biggest new thing in the equation and we saw an extraordinary jump” in crime, he said of the January stats.

Two New Yorkers told the mayor they were considering moving away because of his decisions to put new homeless shelters and a jail in their neighborhoods.

In another sign of de Blasio’s troubles, the Department of Education has had to suspend its drive to racially gerrymander Queens’ District 28 in the face of widespread, multiracial parental fury. The DOE was using the same process that had worked in Manhattan and Brooklyn districts — too many parents are now wise to how the city’s “independent” consultants use a few radical locals to ram through a “democratic” plan without real community input.

Carranza has sparked repeated outrage on issues from altering admissions standards at the specialized high schools to his focus on race-based grievance-mongering to the DOE’s lenient school-discipline practices.

Lots of city neighborhoods have bones to pick with de Blasio over everything from rezonings and jails to homeless shelters and property-tax inequities. And it looks like the discontents have reached critical mass.

If he can’t find some way to turn this around — firing Carranza and dropping the chancellor’s agenda would be a good start — de Blasio is looking at a very rough final 22 months in office. He hashtagged his goals for those months as #SaveOurCity, but New Yorkers increasingly seek to save themselves from him.