Definition: 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.
Input: Comment: Rubbish.  Marijuana has been around since the third day of creation.  Please don't give any credibilty to Reefer madness.  Marijuana is far less dangerous than a host of so called legal products.  

A shame you didn't provide a link to that study.  I would have liked to have seen if there were any critical reviews of it.

Non-identity-attack