Earlier this year, she was threatened with rape and branded a slut by online trolls over the band's music video, to Leave A Trace, in which she wears a short black dress and has wet look hair.
At the concert at Central Park, she responded by suggesting fans would know her views on this.
"I assume, because you're here, that you know a bit about our band, I'm very grumpy, and I don't want that s**t," she said.
"Thank you everybody else, sorry for shaming that one person but if nobody tells you you're never going to know.
"Luckily for me right now I have a microphone and you don't. So that works in my favour."
When another heckler yells out, "Why are you grumpy Lauren?", she responded by extending her middle finger.
• Chvrches will visit New Zealand for the Laneway Festival, February 1.
- AAP