Were the American 50s the pinnacle of Western civilization?

No, the 80s.

I don't understand why 4chan has a hard on for the 50's

Nothing is actually special about that decade.

The only thing that even stands out about it is negative: Constant fear of nuclear attack from the Soviets/Fear of red spies near you.

>>79183732
There were no counter-culture, no feminism and no atheism. Or they weren't so influential.