I have made fun of another man for peeing sitting down, but in a manner comparable to making fun of an ugly outfit. The very hidden secret is I sit to pee sometimes too, and I have ugly clothes that I wear sometimes. To answer the other questions:

If I’m already sitting, I’d pee sitting, 100% of the time.

Yes, and that’s one reason I would sit to pee.

Not spotless, but it seems normal to me. If there’s pee visible anywhere, I wipe it with paper. My wife mops the floor more often than I do.

I don’t have a ready answer for this.