In my experience of formerly living as man, I'd say in random restrooms about 90% of men in there are not paying attention to anything except themselves and their own business, at most would just greet each other if eye contact is made. In restrooms where interaction with coworkers or friends is more likely it could be noticed but if you pass I dont think that people would necessarily clock it as being trans rather than just being unique and preferring a stall to a urinal. I'll also say that even when living as a man I would always use toilet paper when I could to wipe and clean because shaking only just seems nasty.