What does one do when silence simply seems to instigate a person to work harder at making you pay attention to them? Is there an e-hell approved way of saying "I don't want to talk to you?" I'm not really thinking of people you know, more random strangers in public places who seem to consider themselves entitled to your time and attention. But many of them even have the temerity to imply that you are being rude for not engaging them or don't appreciate their commentary.
Clarification edit: I don't own a car, so I walk or take the bus. The offenders are almost always young men making rather crude attempts at flirting - not uncommonly accompanied with unwelcome "compliments". Unfortunately I've had some of them do things like get in my face, try to walk alongside me or sit next to me on the bus, or block my path if I try to leave. Again, usually with the implication that I'm being rude for not talking.