What are the major historical examples where protecting employees from a "hostile workplace" is important? Racism? Misogyny? Homophobia? Do protection from these things look expendable to you?

I'm sure either of us could quickly find a bunch of people who would like to one or several of those acceptable again, yet us finding that such people exist would not tell us a damned thing about whether dismantling those protections is a good idea. Or supposing it does, then one might even make the case that those people existing is an excellent reason for having such a law in the first place.