Every developed country I'm aware of has limts on free speech. Consider that before you start banging on about things like "hate speech is free speech".
Communication is the most powerful tool known to man. You would have to be a complete idiot if you don't think it needs any limits. Civilised society comes with all kinds of limits, and for good reasons, basically without those limits, civilised society cannot exist.
If you acknowledge the value of speech, then you also have to acknowledge the damage it can do, because in doing so you're acknowledging both sides of the same coin. To deny either is to deny both.
IMO a problem with a ban on "hate speech" is that the devil is in the details. In the vast majority of cases, hate speech is incredibly easy to filter because most dickheads inevitably will drop the N word or something equally inflammatory. In such cases, the likelihood of finding anything of value (ie. that a reasonable person thinks ought to be protected) in such tirades is near zero. However, what happens if someone words their hate-filled speech eloquently enough to avoid such filtering? Would the comments they're making fly over the heads of most hate-filled people who want to blame their problems on people with a different colour of skin or religion or whatever and take a dump on them whenever possible, or would something else happen?