Ann Coulter sarcastically blasted the “poor liberal foundlings of East Hampton” to Page Six after being accused by attendees at the East Hampton Library’s Authors Night of pocketing money meant to go to the library by selling her own DVDs for cash.

The right-wing pundit had a booth at the benefit — along with attendees such as Alec Baldwin and Jessica Seinfeld — to promote her tome “In Trump We Trust: E Pluribus Awesome!”

Authors sold their books with all proceeds going to the library. But a spy huffed that Coulter “made a handwritten sign and sold her DVD for cash.”

The source said the DVDs “were going for $25 . . . When an organizer approached and removed the sign, [Coulter] threw a fit and said, ‘It doesn’t matter anyway, I just sold out of all of them.’ ”

A library rep said, “If she was doing that, we weren’t aware. If someone saw this, we apologize . . . She might not have been aware of the standard operating procedure.” When asked if the library received money from the DVD sales, event co-chair Sheila Rogers told us, “No.”

But Coulter initially told us: “This is not true . . . You need better sources in the outpost of the resistance. Liberals are calling in nonsense.”

When we mentioned we’d seen a picture of her handwritten sign reading “cash only” — although all other authors’ books were paid for by attendees at one library register — Coulter said (referring to herself in the third person): “The 80 books that were donated for the book fair were signed and sold, and all the proceeds donated . . . The idea that she pilfered from the poor liberal foundlings of East Hampton is absurd.”

She added, “Coulter’s books sold out one hour into the two-hour event — long before any other author sold out. Instead of disappointing her fans who couldn’t get into the sold-out dinner [afterward], she allowed fans to get signed DVDs at cost intended for the private dinner later. Your snotty liberal correspondent would be surprised at how many secret right-wingers there are in East Hampton.” A source said authors do give out items at the dinner — but proceeds still go to the library.