OK, it's clear that non-contextual, uninvited PMs are unwelcome by you. But humor me a little? For shits and giggles and maybe the public weal?
in a public place, with dozens of other women, when i'm not giving any signals, when they know nothing about me, what other reason do they have for talking to me instead of the next girl?
and, yeah, i am very attractive.
Yes, granted, in the scenario that you present, in 90 something percent of cases he (or she) will be hitting on you. But that's a little bit of an exaggerated scenario, no?
What about if you're standing at a bus stop, or sitting in a waiting room, or having a smoke or grabbing a breath of fresh air outside the club? Any guy who strikes up a conversation with you is assumed to be hitting on you, regardless of what he says or how he says it?
Even if you are so almighty attractive that it is impossible to ignore, is it not conceivable that he's just hoping to have a reasonably intelligent, stimulating, pleasant conversation with another human being?
Do you assume that every man who interacts with you is ultimately just trying to get in your pants?