Mayor Bill de Blasio was booed and jeered by spectators as he marched in the city’s 100th annual Veterans Day Parade on Monday.

One parade-goer — wearing an American flag sweatshirt and a mask depicting President Trump partially on the top of his head — shouted F-bombs as Hizzoner walked past.

Other onlookers called the mayor “Comrade de Blasio” and urged him to go home.

De Blasio waved an American flag and appeared unfazed by the taunts and mocking as he walked the 1.2-mile route along Fifth Avenue from 24th Street to 46th Street.

Among the thousands of spectators at the parade was Cathy Lesser, 53, who said she booed de Blasio “as loudly as I could.”

“He is a moron and doesn’t represent the heart of New York. He is a poor excuse of a leader and a man. He should step down and allow someone with integrity and honor to lead the city,” said Lesser, a Huntington resident.

Before the parade kicked off at noon, de Blasio made remarks at the march’s opening ceremony at Madison Square Park after President Trump kicked off the event.

“We have to aim higher if we’re really going to honor our veterans,” de Blasio said during the ceremony, adding, “We honor some great people today.”

De Blasio spoke of his World War II veteran dad who committed suicide, saying, “He was a man who needed support, needed help, never wanted to ask for it.”

“We owe it to our veterans, not just to ask them once in a while, ‘How can we help you,’ but to make it something we do all the time,” he said, adding, “There should not be a single veteran who is homeless for a single night in the greatest country on Earth.”

Earlier Monday, de Blasio announced a major expansion of programs offered through the Department of Veterans Services that, according to the mayor’s office, will “help the city make huge strides forward in its mental health outreach, and treatment efforts for veterans citywide.”

After he marched, the mayor told reporters that he was “glad” Trump “kept it non-political” when he spoke at Madison Square Park.

“I’m glad he treated it the way I think we’d all like to see things be again — a little more normal, a little more respectful of everyone,” said Hizzoner.