What you described does not end up with the other pax being deemed discourteous, only in your mind.

For the same reason as you wanted darkness, they maybe wanted light, to get their wake/sleep cycle where they wanted it. If that were the case (and neither of us know) you were the one being discourteous by making the self centred request, which immediately brings a certain amount of pressure on the recipient.

You wanted to sleep during the "day" so should have facilitated that yourself, be it with good quality eyeshades, earphones or whatever.

Describing the other parties as you have is poor form.