If someone is abusing, insulting, or otherwise harming you on a regular basis, it's called harassment. Cruel and usually really annoying, harassment is also illegal in some cases.
Harassment is a word that describes any kind of ongoing torment. At school, harassment is often known as bullying. In the workplace, employees need to be careful about sexual harassment. Harassment involves persistent attacks or abuse, and can range from shouting racial slurs to crank calling your ex-boyfriend every night at 3am. Even teasing your kid sister about her braces could be considered harassment.