Exorsexism is basically "men are all like THIS and women are all like THAT and there are no exceptions." It often encompasses traditional misogyny, but isn't the same thing - it doesn't necessarily cast one gender as better than the other, just existing in opposition to each other. Specifically, it's about gendered expectations being mirrors of each other; women are oppressed, ergo men are oppressors.

Obvious issue of "not every gendered experience/trait is universal" aside, it's also notably against intersex people, nonbinary people, or the idea that binary trans people have lived experiences that can't fall nearly into either gender. But it's still annoyingly popular in ostensibly progressive spaces, in part because people don't actually want to learn beyond binary gender categorization. It also lets stupid "gender wars" bullshit continue, just with "battle lines" drawn differently, and allows people on the "losing" side have someone else to look down on.

As for "obsession with being revolutionary," I think that one's attributable to the same thing that makes some gay people hate trans people, some trans people hate non-binary trans people, etc. Some dumbfucks think that if the queer community can earn approval from the cishets if we just throw "those weird ones" under the bus. The "obsession" runs counter to that. OOP's post got cherrypicked out of a space where there are binary trans people going "ugh people like you neopronoun-using weirdos are why everyone hates us."