I know that feeling, at AFest I took off my shoes and sat in the corner with my boyfriend for a while because we were tired (and Madokas shoes aren't comfy >.<) and some dude insisted that I had beautiful feet and kept asking to rub them.... He followed us for almost an hour till he realized we were walking in a circle.
I am not the best example though, if you EVER feel uncomfortable, go with your gut! Avoid the person, try to stay within a group or crowd, never be alone, and if needed, tell an authority. Nobody should ever make you feel unsafe or uncomfortable! EVER.
pic semi-related. Am I the only one who remembers this?