It is Air Canada policy to close the shades and sometimes it's imposed quite aggressively. If that offends you I urge you to boycott Air Canada at every opportunity and encourage those who want the shades left open to do the same.

I fly Air Canada most often and would rather have the shades down instead of satisfying the desires of the tiny minority who want to gape at the window even though it disturbs the majority of passengers. "Look at the pretty clouds!"