"Queer" has nothing to do with sexual orientation, though a disproportionate number of people with non-heterosexual proclivities do identify as "queer."

It's a political orientation -- and could be argued to be a religious orientation -- that is specifically about tearing down what is established and opposing tradition. Not in a "live and let live" manner but a commie "I'm going to destroy everything that doesn't conform to my ideal utopia" manner.

James Lindsay has some good talks about "queerness" specifically in his New Discourses podcasts, including some about "queering" education.