While the story did only get one minor chuckle out of me (Imra: "Why do I look so harsh"), I did not feel insulted by it. As a Legion fan since the late 70s, I rather felt insulted when the Legion was rebooted in 1994 - to make fun about this insult is less of an insult, in my eyes... rather some form of gallows humor, which has to be permitted after all that we've been through.
Still, the story, like most of the Legacies backstories, is totally redundant. The main series is fantastic in my eyes, some of the best books DC has done in years, but those backups stink.