Hate speech is not a thing.

It is fiction.

The hate occurs in the mind. Generally the person most hateful and acting with the most anger and aggression is actually the person talking about "hate speech".

If you want to stop hate speech. Look within yourself, as when you hear something that makes you angry, and makes you rage, that anger and that rage happens within you.

That is the ONLY mind you can control.

So learn to control it, rather than advocating censoring other people.