Queer theory is a phrase that is used to describe the secular study heteronormativity in society. Essentially, it is the LGBTQ version of Critical Race Theory. Queer theory, in fact, stems from the same foundation as other forms of Critical Theory and has its roots in Marxist thought.
Queer theory seeks to understand--from a secular perspective--why heterosexuality has been deemed by society as the "normal" and "moral" standard by which human sexuality is judged. For the queer theorist, heteronormativity has been historically augmented in society through its institutions, including the Church, the legal system, and academics. While heteronormativity is certainly on the decline today, it's important to understand how Churches--including Evangelical churches--have contributed to its decline through its embrace of queer theory.
In 2020, after the George Floyd incident, many Southern Baptist churches began to embrace the Black Lives Matter movement. While most laypeople who went along with the movement were simply uninformed and thought they were doing good, leaders of this movement—for example, a pastor at former Southern Baptist president's Summit Church, Mike Georges--appeared to know exactly what they were doing.
Georges led his church in an anti-police Black Lives Matter march following the George Floyd incident. Black Lives Matter, the organization which coined the "black lives matter" mantra, is well-known for its embrace of queer theory. In fact, Black Lives Matter--both the movement and the organization--stem from the same Marxist roots and are fundamentally inseparable as a movement. The movement is, in and of itself, destructive of Western society, objective morality, and objective normativity. In other words, in the eyes of the Critical Theorists, any form of objective normalcy should be denounced.
This would naturally include normalcy and morality that is derived from the Scriptures.