Probably Sony is upset for:
A. Not having thought of it first.
B. Wanting to sell Sony 3D TVs (Especially since Sony has said they want a 3D TV in every home by the end of 2010.)
C. Wanting people to wear stupid 3D Glasses.
It probably could be said to cover their asses when in 3-5 years they steal the idea and use it in the next iteration of the PSP. I just think it's funny considering most people at the show said the 3DS was a stroke of genius. IIRC Sony said similar statements about the Wii, and probably about the Rumble Feature that the N64 had before ripping off both.
You can read the full article here:
http://www.andriasang.com/e/blog/2010/06/2..._downplays_3ds/

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