As I said on your blog post, the problem with Duty Finder is the anonymity it affords people when they interact with players from various servers. In situations where people would have become pariahs on their servers people who behaved in the manner you describe generally didn't get things done once they had a notorious reputation.

With Duty Finder, however, the servers will always find them somebody to partner up with; people who probably don't know them and don't know what they're like. Even if they did, what choice do they have? Rightly, Square Enix have made it impossible to blacklist or block anyone in anyway in the Duty Finder. Such power would be greatly abused; but it means people who are jerks repeatedly find themselves being involved with people when before they wouldn't. In this way Duty Finder is a catalyst for people who have the tendency in them to be disrespectful, not listen to advice, so forth, so forth.