We had a pro hockey player years ago here plead guilty to indecent
exposure after a neighbor told the cops he had a longtime habit of doing
things around his home/property in ways that were sure to show off his
naughty bits. Such as walking outside to the garage wearing only a
shirt. He'd manually lift the garage door, the shirt would ride up, and
everyone would get a good view. The cops began watching him and caught
him at it. But he was doing that stuff outside, not inside.

Outside in daylight, or inside during the night time, would there be
any difference if the clueless coffee maker had his curtains open?

If this coffee maker would of been standing outside the window nobody
would of saw him. He would of been in the dark. Once he goes inside
with any light on anybody can see him if he has his curtains open.

I'm not saying that he should of been charged, but the replies that
state you're immune from prosecution just because you are inside your
own home is a ridiculous argument.