It fits the brand. Remember, their mantra is captured in Horror & Make-Up: "This isn't Disney, kid, we don't have to be nice to you." I have it on good authority the social media guy is a Bill & Ted alum, and the account certainly shares the comic sensibilities of that show.
A tiny fraction of Twitter users are going to that account for information on their upcoming trip. Posting puff pieces like, say, the Disney Springs account just makes you look like a corporate tool. Do we really need nothing more than the park hours every morning? But engaging your audience, that builds your brand and loyalty to it, makes sure they won't tune you out in the future--say, in a week when you announce a couple Mardi Gras headliners.
In other words, this guy "gets" social media better than Dr. Blondie with her PhD in the subject.