I love the window seat and love the shade up. Having said that, I don't have a problem shutting the shade if it being opened is intrusive to fellow passengers, ie sun angle, red eye flights, immediate seatmate request etc.Within reason that is. Last week a guy across the aisle, sends the flt att over with his request that my shade be lowered.I found this off-putting because none of the usual reasons, glare, sleeping etc existed.My question is, where do you draw the line between proper etiquette with what's acceptable for other's comfort vs your own preference? Thanks