The motivation matters.
Jazz and Rock was the music of african americans that became mainstream in white america just like rap did later. Punk was a reaction to rock becoming boring and stale. Disco came out from the african-american AND LGBTQ community, and the eventual "disco sucks" mainstream backlash was at least somewhat motivated by racism/homophobia, not anything inherent with disco.
None of these creative outlets were a result of anyone overtly TRYING to offend anyone. That they offended was a side effect of them changing the world, and the mainstream reaction to it, not the core motivation.
Now, I don't want to paint 4chan with one brush. I actually think a significant amount of internet creativity and beautiful creation occurs on it, and they never get enough credit for it. Most legendary memes - offensive or not - originate on 4chan. Internet memes are some of the most unique artistic creations of our generation.
But the parts that people get mad at 4chan for (the homophobic/racist/misogynistic parts) are not that. Those are creations intentionally made to get a reaction: "You tell me I can't say ? Watch me!!"
There is a charitable interpretation of this that they are bucking against censorship and fighting for self-expression on principle. And some may draw comparisons to what they're doing to times in history when "blasphemers" criticized religious dogma. That making a homophobic or racist meme is the modern equivalent of proclaiming "There is no God" 200 years ago.
The difference comes down to the Paradox of Intolerance. Religion and the dominant culture associated with it, actively repressed everyone who didn't match their worldview. People were told you have to believe this in faith and act as if you do, or you will be punished. The modern "dogma" of LGBTQ/race acceptance is instead saying "You CANNOT tell others how to believe and act, and punish them accordingly. You cannot discriminate against those different from you by birth race/gender/sexuality."
It is highly childish to associate all "you cannot do " guidances as repressive and similar. And I meant that literally. Children can't tell the difference between "No, we can't have desert because i told you so" and "You can't touch the hot stove because it will hurt you".
So, no, THAT side of 4chan is not counterculture. It's at best children trolling on the internet (I know, I was one), and at worst hateful bigots angry that their acceptance is diminishing in the world and lashing out.