they're just not used to smelling other people's crap and/or aren't smart enough to not breathe through their nose while in a public restroom
Poor ventilation. At home you can crack a window, spray some air freshner, I wish they would improve ventilation in public loos.
Preach it, sister! Testify!!!
The courtesy flush is a long forgotten art form.
No, no, no, the courtesy flush is a flush before the final flush. Totally different flushes. It's kinda like a pre-flush. If more people would embrace the courtesy flush I'm sure the world would smell much better.
because they don't want you thinking your **** doesn't stink?
Well, that doesn't mean that you should pretend as if others want to smell your bodily excretions. Courtesy must still be exercised, as it is still a public area used by other people. Would you like to walk into a bathroom and get hit by a noxious cloud the makes you stagger back out the door and gasp for air? No, you would not (unless you're some sick pervert into that kind of thing). Do unto others' nostrils as you would have done unto your own.
Some people just like to complain about anything.