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?

In Bohemian Rhapsody (2018), Queen is discussing about Roger's car song in the 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?