Have you tried deleting the comments and blocking the user? Here's more help: https://goo.gl/bC5iP1
Our Help Center article has info on how handle cyberbullying on YouTube: https://goo.gl/iZ37gT
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Our Help Center article has info on how handle cyberbullying on YouTube: https://goo.gl/iZ37gT