Instagram's stance on bullying and harassment
This can include hurtful language which targets an individual or group of people, trolling, spreading rumours and excluding people from online communities. In the case of harassment, the behaviour is repeated and intended to cause distress. Repeated harassment should be reported to the police.
Instagram do not tolerate bullying and harassment on its platform. If an account is established with the intent of bullying or harassing another person or if a photo or comment is intended to bully or harass someone, it should be reported.