Well, yes and no. The mainstream culture was far more dominant in the 50s than even 20 years later. And of course there were countless little (and often not-at-all-little!) cultures going on at the time -- and still going on.

But "counterculture" is not merely "alternative culture" -- and no one would write a post describing America today as lacking "alternative culture" because it's both false and also meaningless.

In the 1950s, regular church attendance was over 50%, union membership was at 35% of private sector workers, there were 3 channels on TV, and they predominantly espoused a particular leave-it-to-beaver culture that typified what was perceived as mainstream culture. The fact that it was not actually mainstream in the sense that fewer than half of Americans actually lived that way, is mostly irrelevant.

The '60s counterculture was not merely an "alternative culture"; it was powerful because it made it appear that the progeny of mainstream culture were condemning it; they questioned the power structure of that mainstream culture, despite being its plausible beneficiaries, and they were much more threatening to it than any other alternative cultures at the time (or, maybe, since) exactly because they were perceived as products of that monolithic mainstream culture.

In the US, there is currently no single monolithic culture being preached endlessly in the same way 1950s culture commanded media attention, it's not clear there ever will be one again without a dramatic turn towards the authoritarian, and so it's not at all clear what a national-level counterculture would even look like anymore?