There is a big difference between racism and to speak out your mind!
But while there is a big difference, it still is a tin line!
I'm trying to teach my kids to treat all people, regardless of skin color, religion, status and so on, the same. It that is how they would be treated!
The problem with AI and facebook is that they will define rasism of hatred. Since when do they have the power to do this.
Just like they are banning mother who are breastfeeding their child!

It is easy trying to be the moral knight, when at the back of people you are selling their identities.
But back to the main topic!
It is hard to define those things. Some things could be considered hate speech, while others (also smart people, not the extreme from left or right) consider it okay!

On a open blockchain the same problems will/could arise. We could use the power to flag a post, but others could upvote it. Then it would be up to the users if it is okay or not!

Edit: forgot to mention that I would appreciate some feedback on my latest post. I am normally not the person to ask these kinds of this. But I do feel that is utmost important. Feel free to take a look, no strings attached. I will still follow you, upvote your post and comment you!