Yo, if you're going to reply with a youtube link, would you mind explaining what it's about so we know what we're clicking on?
The person you replied to was clearly talking about racial stereotyping. The objection was to the stereotyping.
A video that debunks reverse racism is not an appropriate reply to what is (at worst) effectively a typo. s/ist/ial/ and done.
Arguments about the term 'racism' don't matter. He meant 'racial'.