Do you have any particular reason to believe that? I've worked lots of places that looked very accommodating on the surface, but that doesn't mean they handle things like bi-polar well. In particular, "obvious" disabilities like a wheelchair seem to get handled a lot better. Conversely, policy exceptions like a bi-polar person needing to take more sick days, seem to breed a lot of resentment in certain sorts of managers.
Because I've been in management in my past few companies and work to accommodate everyone. I find that remote work is especially amenable to accommodating disabilities and mental health.