At one point, the singer urged the entire audience, which included many queer teens, to yell: "I will not be afraid."
Halsey is highlighting the dangerous realities of being a member of the LGBTQ community.
While performing in London Monday night, during Pride month, the "Without Me" singer made a statement by wearing a t-shirt that showed a photo of the lesbian couple who were attacked on a bus last week.
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"Do you guys see the two young women on my shirt?" Halsey, who also had the words "F--k your 'Straight Parade' on the back of her shirt, asked the audience. "Do you know who they are? The two people on my shirt are a young couple called Melania and Chris."
She continued, "And a couple of nights ago, right here, they were assaulted because they're lesbians." (To read more about the horrifying assault, click here.)
Halsey, who is openly bisexual, went on to talk about the bigger issues when it comes to Pride Month around the world.
She began, "The sad reality is after the pride parades are over and after the bars close their pride nights, when the glitter is being swept out of the streets, a lot of people get on those trains and they get on those buses, and try to wash the rainbows off their bodies, and peel the stickers off their clothes."
"Because when pride is over, it's not safe to be gay anymore," Halsey continued. "They're worried that someone is going to viciously assault them or viciously attack them."
The singer then slammed the organizers behind the so-called "Straight Pride" parade.
"So when the people around the world ask the question, 'Why isn't there a 'Straight Pride' parade?'" she asked. "The answer is: because if there was one you wouldn't have to get on the bus and be terrified of getting f--king beaten or killed afterward."
"That's why there's not a 'Straight Pride' parade because every f--king day on public transport is a straight pride parade," she continued. "So we need to take moments like this when all of us are together, we need a moment to remember how lucky we are to have a safe space right now."
Halsey urged the entire audience, which included many queer teens, to yell: "I will not be afraid."
See the moving moment in the clip below.
Halsey getting a room full of queer kids to scream “I WILL NOT BE AFRAID” after two women were beaten for being gay in the exact same town she's performing in. She's wearing a shirt with their faces on the front, and “FUCK YOUR STRAIGHT PRIDE” on the back. pic.twitter.com/VssWprS3gX