Given the many debates i've seen through the years on what is hate speech, and what speech should be banned, I think it is precisely not something we can say is easy to know. Over the course of the last thirty years there have been many changes in how that is defined. Currently in Scotland, you can provoke quite an acrimonious debate on the subject of songs at football matches and is 'up to their knees in Fenian blood' hate speech or a traditional folk song.
I remember back to the campaign at my student union to ban the showing of por n films. (Note Predictive text gave me pork films there but I deny being at university with the Prime Minister). That was defined in terms of what was respectful and derided as feminist nonsense or indeed PC gone mad.
The thread I have just opened on boycotting of Israeli products reminds me of people campaigning on both sides of the divide in the Israel/Palestine troubles that allowing the other side to speak was supporting war crimes/terrorism. One of the justifications for the new legislation is that the boycotts encourage anti Semitism so again we seem to be in disputes about what is hate speech.
I firmly disagree with the stance taken in many student unions but I also remember in the 80s, my stance on some aspects of what should be allowed at my university on many subjects would have been.described as irrelevant by some because of my gender, sexuality, colour, nationality or any combination of those. We hadn't invented checking ones privilege then and that I was cisgendered was not a phrase available either, but the approach and rhetoric remain very similar even if the terms have changed.