I'm also one of those who likes to keep the window shade up. I find that I feel better when I have that sunlight coming in on me plus it gives me a sense of space. Even flying in First or Business can get a little claustrophobic. I just flew across the Pacific in First & had two window shades. I pulled them both half way (my husband was next to me so he didn't care one way or another).The movie hadn't started yet but many passengers were watching their personal videos. The FA "told" me to pull the shades down. I did but I didn't like it & if I had argued they probably would have called it air rage. I felt that I paid for that seat (abeit with miles) & I specifically asked for the window seat. I certainly don't ask other passengers to keep their shades up because that's what I want, so I feel that I shouldn't have to lower MY shade just because they have a problem with sunlight.
I'm glad someone presented this topic. It feels good to vent.