Speaking as a man: it’s rather obvious when one is being too aggressive to another person (female or male.)

Those who can’t tell this have something wrong with them. Whether they’re sociopaths, psychopaths, or just lacking in intelligence.

Trying to flirt with someone is not harassing them.

Trying to flirt with someone over whom you have some authority/power adds the element of the possibility of harassing them, which is why responsible men avoid this type of situation.