No it's not. It's as mainstream as you get. One of the two major parties ran explicitly on a platform of transphobia ("keep men out of women's bathroom", "your daughter is being beaten up in sports by a man"). You can't call it counter-culture anymore.
And in most of the Western World the main culture accept trans people. They may differ on who can take pills at what age or if the state should pay for surgeries (is it cosmetic, is it vital) but people who'd beat up transgender people for who they are would be shunned.
If I watch or read modern cultural product, there are huge chances some character will be officially transgender or the theme will be present (shout-out to wildbow). That's being part of The Culture. So being against it means being against the culture. Culture changes over time thanks to people against the status quo (counter-culture). You may have been counter-culture in your youth but once your cause has been accepted you're not counter-culture anymore. You won: celebrate. A meme is how Rage Against the Machine has been Rage for the Machine for a long time already.
Now once you accept you're older, you won, you're for the current status quo you may feel some dread about two things: are you still relevant? (hence why many groups will always try to prove their fight is not won); and: what are parts of the status quo which the new generations of counter culture want to see change (and surely for a good reason). What's the "lobotomy for everyone" of our generation?
Counter-culture feels like it requires at least an 80/20 or so.
