I was just about to post the thread posted above.
OP, consider yourself lucky that you only got yelled at and that you weren't arrested or, worse, thrown off the flight in the middle of your journey.
The hostility of this airline towards its customers is absolutely unprecedented and experiences like yours and Matthew's continue to illuminate the degree to which they hold us in disdain for the act of taking a flight with them.
Technically speaking, you did photograph "equipment" and therefore violated the rule.
How you feel? Why they treat you this way? Why this matters? How it's relevant? That's not something they care about. It's all a power trip.
Here's another example that shows how easily, quickly, and viciously this airline can turn against you if you even so much as open your mouth:
http://www.flyertalk.com/forum/unite...omplaints.html