If I say something, it won't stick, and I'll appear to be the crazy OCD guy who needs to "chill out, man." This is what people do in these situations - refuse to take accountability/responsibility, and project their own faults onto others with passive aggressive nonsense. I hate these games people play. I've grown wiser to know it's a bad idea to show frustration to people who aren't going to be considerate of it. They'll just do what they can to piss you off further.
As a male, I hate males. There's something about guys where they take pride in being slobs. "I'm a guy, cleaning isn't my job." Females aren't less disgusting, but in my experience they're aware enough of their surroundings. Guys just don't care. Just like tyrphanax's roommate who shoots snot rockets - who the hell does that? It's psychotic. People are inconsiderate assholes.