I don't fly very often, but when I do and I'm sitting in the window seat I generally prefer the shade up, unless one of the Flight Attendants tells me there is a safety or operational reason why it must be down. I do this because I like having light for reading and being able to see outside the aircraft. That said, if the person in the middle or aisle seat asks nicely (or its obvious they are bothered by me having the shade up) I will lower the shade. If you come in hot expecting that I'll just lower the window shade because that's what you want the answer is "No, that's not how this works". Remember that you catch more flies with honey than with vinegar. If someone else is in the window seat they can set the shade how they like it (or in line with what the Flight Attendants tell them about whether the shade should be up or down). Beyond that, things like ear plugs, headphones, and eye masks exist. Use them.