I thought "insult a Juve player" thing was only for the non-Juve fans who want to provoke. It gives a good reason to ban them.
I don't think it should be applied at all to the regulars here. If I want to talk crap about a player or to provoke his fanboys, I can do it without swearing. And if the goal of this warning is to prevent heated off topic discussions and arguments, then the rule itself isn't really stopping those because, as I said, one can start an argument and make fun of a player without technically breaking that rule.