I used to be free speech absolutist until we get to the conundrum as you presented. For me, free speech will never be settled and is a perpetual debate. I think what is considered hate speech is on a case by case basis. Like an individual human who is being tried on a court and his/her case is examined, what is considered harmful or free speech is kinda like that. We examine the minutae of the speech based on the context, semantics, syntax logic, reasoning etc. if the speech can be considered harmful or not. It’s a perpetual debate.