Hollywood has been widely known as having a leftwing cultural facade since the end of WW2 (and the waves of migration that came with it). Likewise almost every popular musician since the 1960s counter culture has been leftwing.

Before then you had the politics of the 1950s which was traditionalist to the point that women couldn't even wear pants. It was considered a cultural affront to the culture.

Why you're denying all this history I don't know. You're probably just ignorant and decided to spit venom online rather than take a moment to ask what represents popular cultural power.

Or you just don't think 2nd wave feminism, the civil rights movement, and hippies were leftwing because they're not the by your nodern standards. No, the left have been in cultural hegemony for most of living memory, at least since the big cultural landmarks of the 60s and 70s.