the deliberate or ongoing process of excluding particular groups of people from something; the opposite of incorporating inclusion.

The institution of marriage was, and still is in many respects and countries, Queer exclusionary: that is, by restricting marriage to opposite-sex couples, Queer people were excluded. Other institutions, such as religious institutions (e.g. churches) also excluded Queer-identified people, deeming them unworthy of participation.

Sadly, there are some groups within the Queer community that are exclusionary; for example, some gay and lesbian groups may be bi-exclusionary, by deeming bisexual+ people as not being “gay enough” to participate; and the increasing rise in trans exclusionary spaces and groups that act in opposition to trans-identified people.

Some Queer spaces have, and continue to, exclude asexual participation, particularly for people on the asexual spectrum who may not be homo or biromantic.

Whilst such exclusionary groups may insist otherwise, the deliberate act of exclusion is, whether by straight or non-straight people, the result of homophobia, biphobia, transphobia, acephobia, etc.