You will be given a definition of a task first, then some input of the task.
In this task, you are given a public comment from online platforms. You are expected to classify the comment into two classes: identity-attack and non-identity-attack. Identity attack refers to anything rude or disrespectful about someone's identity, including appearance, race, gender, and sexual orientation.

Comment: To Matthew Singer, the Author of this crap, why don't you try reviewing concerts of only those you like cause it's obvious that you already "disliked" Justin before even going to this show. I had several friends at this show and they loved it! He always puts on a great show, even when he's not feeling so great. Get off the "hate Bieber" train, he doesn't really need you as a fan!
Output:
Non-identity-attack