It depends how you define "racial hate" and how you define mental or social harm. I also do mean social harm, not societal, meaning to catch things like sunset communities (ie restricting where people can live, or where they can go), rather than "society is worse off because of people's opinions."

Again, in my opinion, it depends on intent. If you make a post on your blog with 200 followers saying "I'm tired of X race moving to my city," I don't think that should be illegal, even if it is disgusting behaviour. If you post it to (eg) a community group for those people, I'd say it should be illegal.

That said, I'm very liberal on policing, so believe that the state shouldn't be responsible for policing morality, which people may not like when they realise it involves making things that are pretty much objectively immoral legal, regardless of what they are.