*shrug* let me save you a trip. Defamation like this is 99% a civil case. The police will tell you to find a lawyer because it's not their problem.Whatever it is, I'll be the one bringing the prove and screenshots to the police if this affects me ...
Prepare $20k to bring the case to court if it affects you.
Of course, if something "unsightly" happens to canongrapherL's existance, it'll probably end as a police case, I'd just like to point out that prime suspect would be Cyber + you for the veiled threat he posted.
I'm still on the fence about the issue, and I'm keeping my neutrality for now.