Harassment and bullying are never okay, whether it's online or off. Harassment means repeatedly contacting someone in a negative way, even though they have asked you to stop. Harassment is one aspect of bullying, which is when someone uses their strength to hurt others weaker than themselves.
Remember, not every bad interaction is bullying or harassment. Bullying does not mean "someone told me I was wrong", or "someone blocked me", or even "someone called me a bad name". Harassment and bullying are usually persistent attacks from someone who will not stop.
For more information on harassment and bullying, see our harassment and bullying resources page.