Rudy Giuliani did not have fun at the Al Smith charity dinner

Rudy Giuliani found himself in Hillary Clinton's crosshairs during the Alfred E. Smith Dinner Thursday night, and the former New York City mayor did not seem to like it.

"Many don’t know this, but Rudy actually got his start as a prosecutor going after wealthy New Yorkers who avoided paying taxes," the Democratic presidential nominee joked. "But as the saying goes, if you can’t beat 'em, go on Fox News and call him a genius."

Rudy Giuliani was not amused by Hillary Clinton's remarks at the Alfred E. Smith Dinner. https://t.co/0bKZ53HSGO

— MSNBC (@MSNBC) October 21, 2016

The line was a dig at Giuliani's decision to passionately support Trump, who has so far refused to release his taxes. In addition, a New York Times report earlier this month suggested the billionaire businessman may have avoided paying any federal income taxes for roughly 20 years.

While the audience seemed to get a giggle out of the line, Giuliani, who didn't even crack a smile, was not amused by the comment.

At another point during Clinton's remarks, the former secretary of state joked about Trump's past comments about women.

"People look at the Statue of Liberty and they see a proud symbol of our history as a nation of immigrants, a beacon of hope for people around the world," she said. "Donald looks at the Statue of Liberty and sees a four. Maybe a five, if she loses the torch and tablet and changes her hair."

It appeared the joke either went over Giuliani's head, or he did not find it at all funny.

Hillary: "Donald looks at the Statue of Liberty and sees a 4"

Rudy Giuliani: pic.twitter.com/I852PUw8mf

— Brandon Wall (@Walldo) October 21, 2016

During the charity dinner, which is a fundraiser for organizations associated with the Archdiocese of New York, both Clinton and Trump took shots at each other and made self-depracating jokes about themselves.

Trump, for his part, lobbed a few clever lines against Clinton, but drew the most attention for the boos that followed a suggestion that his rival "hates Catholics."