If that is an example of the "slander" Zed speaks of, his response is way overboard. It has that "more hacker than thou" tone that I find annoying in anyone (and most annoying when I catch myself using it, which is often), but I can't imagine anyone would consider it slanderous. And, it is by a no-name account, which, I suspect, makes everyone somewhat less likely to pay it any mind. The idea that something like that constitutes a years-long campaign of defamation against Zed is worryingly like paranoia.