Can someone with a better understanding libel law shine a light on me, because to my mind calling someone an ass isn't a factual claim, it's pretty evidently a subjective one. If Gabe had accused James of an assault, true or not, would that not be the grounds for a libel suit if James contested that statement?
Yeah, for Libel, you generally have to make claims that aren't true. For an insult as generic as "He is an ass", its very hard to prove that it is true or false, since its basically an opinion.
Now, if Valve said something like "James is a Pedophile", "Jame is a Neo Nazi", or "James physically attacked our employees" , and he those weren't true statements, then it would be Libel.