Harassment is on you, not your character

Your character can be a villain. You can't be cruel to a real person. Slurs, sexual harassment, targeted abuse, or anything that crosses from in-character conflict into hurting the actual person behind the screen is harassment — and “it's my character” is never a defence.

Fine: your character threatens, robs, or genuinely hates another character in the story.

Not this: using an in-character conflict as cover to throw slurs, sexual comments, or real-life jabs at the player.