Ok here's another lukewarm take: I strongly believe the heterosexual partners of bisexual people, the supportive cis-heterosexual families of queer people, people who are unsure whether they are queer or not, are also part of the queer umbrella if they want to be.

In all honesty nobody has to prove or demonstrate their queerness, queerness is an amorphous and very personal term.

Now that being said, we all need to know when to take up space and when to give it over. Every person under the umbrella needs to appreciate individual privileges

Queerness is between someone's ears, not their legs, or in their dating history.

A gay man can have only ever been with women.
A trans woman might not have transitioned.
A bisexual woman may have only been in same-sex relationships.

The door to queerness has to be ajar.