I fully intend to tell HR that they have a huge potential lawsuit sitting in the chair across the wall from me.

I feel I'd only be doing them a favor in making them aware of it. Not everyone is as against lawsuits as I am. A chiropractor totally wrecked me once, and I didn't sue him. Sooner or later, someone is going to get wickedly angry at one of his racist or sexist remarks, and they'll have a huge mess on their hands.