Unless you're JK Rowling of course, because it seems perfectly legal to threaten her (and other women) with all manner of vile things and get away with it. How many people have been arrested for threatening to rape and murder her?
This is why, when people harp on about the tone of her tweets, I roll my eyes. The absolute tsunami of abuse she receives and you expect her to remain only sweetness and light? The woman is only human, and it would be enough to make a saint swear.