Shitposting is ad hominem? It is very close to 100%, not 50%. When surrounded by shit, best you can do is try to blend in.
I disagree vehemently. Proper shitposting is neither an art nor science; it can be more accurately described as a religion or lifestyle. What it is certainly not is an ad hominem argument.
An ad hominem argument implies that an argument in question is rendered completely invalid by unsavory personal characteristics on behalf of the person behind the argument. At least, this is the intention of the person behind the ad hominem attack.
Shitposting does not imply this. Shitposting is, by very definition, only intended to deliver personal insult and humour. A reasonable person understands that shitposting's place is wholly transcended above that of the ad hominem argument. A true shitposter isn't at all worried about winning an argument. In fact, the very best shitposters won't even target an individual unless they've no other choice (read: niggas not checking themselves).