An unhinged man was caught on police bodycam video going on a vile, racist rant at an Asian-American NYPD detective during a protest in Manhattan. The officer, a 16-year veteran of the force, was assigned to a march near the Stonewall Inn on March 11 when a protestor approached him and began spewing anti-Asian slurs, according to sources with knowledge of the incident. “Suck a dog’s d—k, p—-y. Then cook it and eat it in front of your mother,” the man tells the cop, according to footage of the shocking incident obtained by The Post. He goes on to tell the officer to have “a goddamn tea party,” before repeating the word “soy sauce” in a mocking accent. The creep ends his hateful spiel by asking the officer if he was going to put it on the “lunch special.” Sources said racist verbal attacks on minority cops such as this one have “soared” since last summer, when the city was rocked by protests against racism and police brutality. The officer targeted in this incident contemplated filing a complaint but reconsidered, believing the harassment may not have risen to the level of a hate crime, according to the sources. It comes amid a surge in attacks against people of Asian descent in the Big Apple and across the country. Mayor Bill de Blasio last week said cops should “confront” people accused of “hurtful” behavior — even if the behavior doesn’t rise to the level of a crime. Asked if the NYPD and city could be doing more to thwart the troubling spike in hate crimes against Asians, de Blasio suggested the warnings could be a last resort. Sources said the man who unleashed the rant is known to police as he has been previously arrested on charges of making terroristic threats and aggravated harassment. Paul DiGiacomo, president of the Detectives’ Endowment Association, told The Post the incident was “disgusting and despicable” — but also “not at all surprising.” “This is the sad reality that police have to deal with and feckless politicians have invited,” the union head said. The detective involved, “deserves high praise for his calm reaction,” DiGiacomo added.