Mayor Bill de Blasio made CNN’s ratings plummet almost as low as his poll numbers with his town hall event Sunday night.

Just 376,000 viewers nationwide tuned in to see Hizzoner for the 7 p.m. event, according to Nielsen.

Combined with Steve Bullock’s 6 p.m. town hall, CNN registered a 25 percent drop in its average Sunday night ratings.

Bullock performed better, with 429,000 total viewers.

In a statement, CNN said the network “does not host presidential town halls for ratings.”

“We host them because substantive conversations with presidential candidates inform and empower voters to make the best possible choices for their families and communities,” the statement read.

During the event, the mayor was hounded by protesters supporting the family of Eric Garner.

“You waited five years and you did nothing,” activist Julianne Hoffenberg shouted while the mayor was speaking about last week’s firing of NYPD cop Daniel Pantaleo.

Police Commissioner James O’Neill said Monday that Pantaleo “can no longer effectively serve as a New York City police officer,” ending Pantaleo’s career at the NYPD.