Rep. Alexandria Ocasio-Cortez (D-N.Y.) appeared unfazed by Trump supporters chanting “AOC sucks” at a Grand Rapids, Michigan, rally Thursday, chiding her critics for targeting her with the insult.

Before President Donald Trump spoke to the attendees, his son Donald Trump Jr. took the stage and claimed that Ocasio-Cortez was barely aware of how the U.S. government operates, a reference to her misspeaking in a video last year.

“Think about the fact that every mainstream leading Democratic contender is taking the advice of a freshman congresswoman who three weeks ago didn’t know the three branches of government,” he said. “I don’t know about you guys, but that’s pretty scary.”

The audience then launched into the chant as Don Jr. stood watching and laughing, before telling the hecklers, “You’re not very nice.”

Ocasio-Cortez chalked the reaction to haters simply looking for a female to attack.

“You know this is part of a pattern that the right and the far-right and, frankly, the president is consistent with,” she told CNN on Friday. “He doesn’t have another woman ― Hillary Clinton or whomever else ― to vilify anymore, so they need to find another woman to kind of prop up and become a lightning rod.”