The fan was continuously yelling out the name of Halsey's (cheating) ex-boyfriend G-Eazy, to the point where Halsey absolutely SNAPPED.
Thankfully, there was a video.
"WHO'S F***ING YELLING IT? CAUSE I'LL KICK YOUR ASS OUT OF THE F***ING CLUB!" she began, leaning over the crowd to find the person.
"YOU WON'T DISRESPECT ME LIKE THAT AT MY OWN SHOW!" she continued to yell as she pointed out the fan in question.
But it didn't end there.
"Who is it, cause you can go right now."
Shortly after nobody came forward, she turns to the crowd and started the chant: "F*** that guy! F*** that guy!"
Later, the singer addressed the situation on Instagram.
She wrote on a story: "don't ever let someone make u feel crazy or unhinged cause ur a woman standing up for urself. don't tolerate disrespect in the name of being 'nice'. Love u"
It comes after Halsey BLASTED G-Eazy during one of her SNL performances this time last year, after it was revealed that he had cheated on her.
While performing her hit single 'Without Me' on the show, Halsey displayed G-Eazy's TEXT MESSAGES on the screen.
"I'm so sorry Ashley (her real name) I cheated," it read.
You can watch the entire performance here.
Now, Halsey is in a happy, healthy relationship with Evan Peters.