Yeah I've been to Cambodia, Laos, and Malaysia often and see white guys followed sometimes. Usually once they say they're not interested, working girls will stop. They aren't trying to annoy anybody, just trying to make a living.

I've had this happen to me. I'm pretty happy to talk to anyone who approaches me so I made the mistake of saying hello to a girl who said hi to me. Being on Khaosan Road I should have known better. Anyway, she kept following me and asking me to engage in various acts for money, or even for "free". I kept saying no thank you, I'm good, but she kept following. I had to form a brisk jog to get away.