Most Helpful Guy
If it were me I would literally ignore it. Just turn my computer off and go about my day. Block him on my phone. If he ever said anything in person I'd bash his fucking skull in.
Most Helpful Girl
I honestly don't think the cops would get involved. Although he's being a mean asshole, I wouldn't think what's he's saying is actionable. He's not making direct threats. They'd probably advise you to report him on FB and block him, which you have
As long as you've cut all means of contact I'd just let it go. Unless he starts stalking you wherever you go , and consistently turning up at your home. Stalking is illegal, but not name calling is not