In *Bohemian Rhapsody (2018)*, Queen band discussing about Roger's car song in upcoming album, which is about to release:

> Freddie: We could all murder each other...but then who would be left
> to record this album? 
> 
> John Deacon: Statistically speaking, most bands don't fail, they break
> up.
> 
> Freddie: Why the hell would you say something like that? Roger,
> there's only room in this band for **one hysterical queen**.

What does "one hysterical queen" refer to?