Hate speech is free speech in the US. SCOTUS has ruled on this many times: https://en.wikipedia.org/wiki/Hate_speech_in_the_United_Stat...

Still leaves the pornographic movies. America doesn't have absolute free speech. Maybe the Supreme Court would strike that down, too, but currently you will be fined.

There are other instances like swearing on TV.

Pornographic movies are quite legal in the US. Heck, SCOTUS struck down the provision of the Communications Decency Act that prohibited knowingly transmitting obscene or indecent images to those under the age of 18. Their ruling was unanimous.[1]

The radio spectrum is regulated by the FCC. If you want to broadcast on it, you have to get a license and abide by the rules. The FCC has many rules about the content of radio communications including the frequency, the modulation, the maximum transmit power, and yes the content. For example: amateur radio & citizen's band communications can't be encrypted. But even when it comes to broadcast TV, some swearing is allowed. And you can swear as much as you want on cable or streaming services.

1. https://en.wikipedia.org/wiki/Reno_v._American_Civil_Liberti...