Just saying there's a great difference between throwing back an insult to someone who pisses you off online, and intentionally targeting someone and going through great lengths to cause harm to a person out of spite.
It wouldn't be too difficult to show this in court nor would it get a hearing if examples you're giving are shown up.
Note that freedom of speech is a privilege that is strictly subjected to time, place and manner. Whether it's on or offline shouldn't make a difference.