Part 1. 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.
Part 2. Example
Comment: It's bad enough we already have all these American sicko's living in this country shooting up theatre, schools, churches, malls, etc., we don't have room for crazy muslims.
Answer: Identity-attack
Explanation: This comment contains identity attacks on both American and Muslim.
Part 3. Exercise
Comment: Cue the modern day equivalent of flat-earthers and their infinite wisdom devoid of any real scientific data regarding climate science, because as we all know the climate has been changing since the beginning of time, so how could humans possibly be affecting it?
As if that's an argument. Then when you show them links to hard scientific data, they start mindlessly mumbling something about Al Gore and a global conspiracy, or some damn thing.

The most frightening thing is some, or maybe even most of these dimwits are registered voters. No wonder America lags behind most industrialized nations in math and science; roughly half our population believes in an invisible entity up in the heavens that calls all the shots and works in mysterious ways. Hard data painstakingly gathered by scientists over the course of years, decades, and in some cases even centuries, is disregarded as if it's some sort of voodoo.

Flat earthers and climate science deniers are of a similar mind; small and narrow.
Answer:
Non-identity-attack