Trans people generally do believe that gender roles, behaviors, clothing, etc. shouldn't be compulsory, and that individuals should feel, speak, act, and behave however they like. You'll find very few trans people enforcing what it means for anyone else to be a man or a woman. When I was younger, some of my fellow transgender men used to suggest that I get a different haircut. (In retrospect, they were right. I would have looked better with another haircut. Doesn't matter anymore because I've gone bald.) But those guys were just making style suggestions, not enforcing my gender. They weren't implying I needed a real men's haircut to be a real man.
Some people—cis and trans—do enjoy their gender sometimes ("fun, not oppression," as you put it), even while recognizing that on some level gender itself is oppressive. That's OK. Gender is complicated, and feelings are complicated. Policing our own joy is not going to get us anywhere. If we're annoyed by what gender does to us six days a week, and on the seventh day we feel calm and at peace with ourselves and others, great that we can take a day off. You're telling us we'd be happier if we didn't feel dysphoria (sure—by definition), but you don't want us to have fun either. I don't know what un/happy emotional medium you want me to strike, and why the ability to fight sexism (mine and everyone else's) depends on me staying within an emotional medium place. Which, come to think of it, sure sounds like an enforced gender expectation, because you're telling me how I need to feel about my gender while I'm overthrowing it.
The part I highlighted above is the only call to action I can find in this essay. There, you say the "oppressed class" should "ris[e] up against the oppressor," thereby eliminating the hierarchy, destroying gender, and giving us a "new social reality." That's extremely vague. Exactly what do you want us to do, and how will we know when we've achieved it? Meanwhile, why can't trans people be trans? It seems you're bothered that someone might be having "fun" while another person somewhere else in the world is suffering gender-based trauma. Why worry about the person who's having a good day and blame that person's happiness for causing everyone else's unhappiness? That's puritanism. We could find the real cause of suffering and human rights offenses. (It's not the existence of trans people.) Societies need to end the human rights crime of sex trafficking; I don't know the best way to accomplish that, but I know it isn't by resenting the joy of a trans person who finally smiles at themselves in the mirror.
