If you are on the receiving end, and it feels to you like harassment, then it is. To intimidate someone means to instill fear in them, through threats and threatening actions. When people are afraid, they are denied the possibility of developing to their full potential. Discrimination happens when we single out an individual or a group and treat them differently, in a negative way. Discrimination can be based on race, gender, language, disability, sexual orientation, religion, family status, etc.
Sexism is the mistreatment of one person by another, based solely on their gender.
The term normally refers to the system of attitudes, assumptions, actions and institutions which makes women and girls in our society subject to discrimination and disrespect, and vulnerable to harassment and violence. Racism is systematic discrimination, mistreatment, or exploitation of any individual or group based on the belief that they are racially or ethnically inferior. Differences of power and privilege go with and reinforce racism. Stereotyping and prejudice are attitudes and beliefs that can lead to harassment and violence.