UPDATE: The "Tweet" above looks to be the work of a bored individual with Photoshop. Thanks to some detective work from Blues fans and a blogger from the enemy side of things, The Royal Half, the alleged failed attempt at snark looks to be fake.
It looks like someone took this Tweet by the Blues about Steen's winner and edited it to read the message you see above.
The proof comes in one of the larger screen grabs. As you can see, the "you're welcome" Tweet just so happened to be sent at the exact same time as the Steen Tweet and it received the exact same replies as the Steen Tweet. Obviously, this photo essentially confirms that the Blues have more sense than I, and the folks over at CBS originally gave them credit for.