Again, you're drawing an entirely arbitrary line between physical violence and "hurt feelings". You're reducing speech to just "other people's opinions" but as the U.S. courts have held many times, speech isn't just opinions.
The other thing is that I guarantee you this is totally selectively enforced and prosecuted
Unlike all other laws? Tell me, who is more likely to end up on death row? To be prosecuted for drug possession? How much jail time is a rich white student likely to receive for rape compared to a poor black student? All laws are selectively enforced and prosecuted.
I don't know what point you are trying to make here or if you know what freedom of speech is. Government schools and government education bureaucrats developing policies about curriculum and teaching materials doesn't seem to offer useful commentary about freedom of speech, so I really don't know how to respond to your question.
You don't understand that Florida schools banning books because they contain references to homosexuality is a free speech issue? Judge Carlos E. Mendoza in Penguin Random House v. Gibson said "The state’s prohibition of material that ‘describes sexual conduct’ is overbroad and unconstitutional.”. Unfortunately, many other judges did not rule the same way.
The point is that the "free speech" you lord over other countries is arbitrary, those who proclaim the U.S. to have true free speech and countries like the U.K. to be oppressive anti free speech regimes are delusional and have been conned by U.S. exceptionalism.
You can disagree with another county's choice to draw the line somewhere other than where the U.S. draws it but to proclaim the U.S. has real free speech that stands alone from other countries is lying to yourself. What, exactly, is unique about the U.S. free speech laws? That it is a constitutional amendment?
We could debate where the line should be, whether the U.K. or the U.S. has it right or wrong, but to argue that the U.K.'s laws are somehow distinct from the U.S. laws is nonsensical. I do not agree with where the U.K. draws the line. I also do not agree with where the U.S. draws the line.
It must appear as a spectrum to you because you've been taken in by propaganda used by authoritarians and fundamentalists to justify using actual violence and censorship to crush dissent and criticism.
And for one last final point: how many protestors has the U.S. government killed this year? How many protestors have been killed by the U.K. government for protesting against government policy? I'm sure Renée Good and Alex Pretti and all the other murdered U.S. protestors are comforted in their graves by the glorious anti-authoritarian pro-dissent free speech laws that protected their dissent and protest so well.