She said this album is about nights throughout her life. So if it did happen, it's not a reach to think she may have reflected on it.People’s obsession over her an Karlie is odd. Even if it did happen it ended six years ago
Some fans think songs on the album are about Jake or Harry which happened a decade ago yet it is "okay" to speculate about.
I think some fans just don't like the idea that she maybe snogged a woman because it doesn't fit their ideal narrative .
She could be with Joe and still have hooked up with Karlie. Both can coexist. Bisexuality is a thing.