Boilerman's mind is in the past. It used to be true, during his formative years (ha, ha), that hate speech was 100% allowed, in all circumstances. Federal (and many state) hate crime laws now forbid it in most contexts. Boiler, in general, like so many of his white conservitard geezer friends, doesn't understand that it's not the 1950s any more.
The distinction is that while the speech itself, in a vacuum, might be legal, it is not legal when used as part of a crime. Such crimes include threatening, harassment, intimidation, etc. as well as the standard white-boy stuff such as assault and murder. So when you use hate speech in public, you can be prosecuted if a member of the group against whom you are speaking hears it. Using Mark's example, burning a cross on the sidewalk in front of a black man's home is illegal hate speech as soon as that man or any other member of the black community sees it.
This does mean that Boiler can continue to hide in his basement, and write (and/or scream) over and over, "I HATE ***********!" in his diary to his heart's content, without fear of criminal prosecution. It's the same as the exercise of any right. That right is curtailed if and when someone else is harmed.
All this is a little too deep for Boiler.