Answer:
first of all, raise your voice at them and be as incredibly firm as possible. tell them no and back off or you'll really regret it. then, if they persist further, you have more than the right to get physically firm with them. punch them, slap them, kick them, anything to let them know what's what, and to keep them away from you. also, try to get into a place where there are a few other people, and start yelling for help, to humiliate the person, and to ensure they won't try anything.
Step-by-step explanation: