I wasn't going to add to this thread, but now I can't believe how many control freaks there are in this world! Do these people have so little control in the rest of their lives that they have to prove something with, of all things, a friggin' airplane window shade?
Who was it that said "Can't we all just get along?" I try to follow that rule and have never gotten into the slightest hassle over a window shade - and I fly about 100,000 miles a year. Maybe I've just been lucky to draw a higher class of seatmate than average.
A perfect solution, of course, is to get the A seat in any row of a Saab 340 turbo. (That also avoids the movie-watching issue.)