I'd have to agree with your reaction.
Luckily I avoided GAF from the point RAW started Live until Smackdown was finished for I knew that people would spoil it. Such a shame for it was truly spoiled for you and everyone else in the same boat. Once you went on GAF there was no way you could have avoided it since the OP put the spoiler right in the title. Damn, it was such a joyful moment when he debuted too for all the rumours was pointing Shinsuke to RAW (disastrous mistake and the same to Asuka if they attempted to put her there) and HHH was fighting Vince hard to get him onto Smackdown, a moment you sadly missed.
For shame, OP. For shame... A little more tact next time. No, it doesn't have to go in the Wrestlemania thread for that thread is pages forever long, but please be careful the way you present such important info.
Why is it so significant that Shinsuke debuted on Smackdown and not RAW? Are the shows that different?