Petty reasons, likely cuelty or as a dominance display born of insecurity.

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.

I will go ahead and be the only person to honestly engage with the terms of your question.

There is a movement that started a long time ago and continues today to "domesticate" boys. Boys are invariably more disobedient in controlled classrooms and group activities and so they need to be "broken in" and taught how to conform to the requirements of modern life and education. Girls tend to fit into this structure more easily as can be attested by the higher educational outcomes among women in countries that allow them to achieve it.

With this in mind there is a lot of resentment against this "breaking in" process. This metastasizes when boys hear all about how "toxic" they are by virtue of how they were born, how much more trouble they are to deal with etc. The emotional response is to resist all attempts to demasculinize them, even in the case of something as inconsequential as bathroom etiquette.

This is an honest representation of the perspective in question. Don't get all passed off at me for being capable of presenting it.

There is an argument for standing to pee since it empties the urethra more completely compared to sitting to pee. This is mostly relevant for 40+ people since they are more likely to have any issues.

Simple trick to shit/sit and pee and still empty everything is to push on the area between dick and butthole.

Sitting to pee is normal, standing up is for public bathrooms and in nature.

I don't think people really care, lol. Unless they like to learn their friends peeing preferences, they probably have an ulterior motive if they are that interested.

I pee sitting down at home because I use a toilet SEAT. It is designed to be used sitting down. Put a urinal in your home if you're too insecure to pee sitting down.

If I have to poop as well as pee I sit. Who cares what some insecure dude thinks about that?

I very often sit down to pee, but not exclusively. Some times I feel like standing.

No follow-up questions, thanks.

I sit facing the toilet so that I don't have to turn around to push the flush handle.

my passion is jerking off constantly

I don't know who y'all hang out with, but my friends for decades have given each other shit for anything we can possibly think of. It's a form of male bonding.

You're not going to hear from men who actually do this because they don't have a good reason and aren't typically comfortable with the kind of introspection the question demands.

Some people are exclusionary pricks who look for excuses to judge others. They don't have or need a reason. It's bullying.

Be a rebel; stand to shit

Guys who do diss other guys for not peeing standing up have major self esteem issues or insecurities.

I'm a man and I pee sitting down because:

• it's more comfortable
• it doesn't splash pee water everywhere all over the toilet bowl and the floor or my pants.
• can access the toilet paper easier to wipe clean instead of just shaking it and having a wet pee stain on my underwear
• I have my hands free to use my phone
• I can also fight anyone that might barge in an try to assault me while I pee without peeing on myself so it's a tactical defense position.

As a man WHY THE FUCK ARE YOU TELLING ME HOW YOU PEE!?! What god damn conversation is going on!?! How the hell did this come up? We don't normally talk about this!

My true passion in life is Aztec history.

I mostly sit down when I pee because my cat likes to spend quality time when I'm on the toilet and he gets upset if into in the bathroom and don't sit down.

Remember manliness is not caring about how other people define manliness.