Consult a lawyer. I didn’t have a free formal consultation with a L but did manage to get a few questions answered through email without paying.
Calculate the cost/benefit and see whether some things are worth fighting for.
Document your interaction with H. Make notes of what he’s said.
Communicate with H by email. Even if you two live under the same roof. For documentation. He’s spewing hate in your face and making threats, that’s harder to record. But in email there’s proof.
Like Gerda said, watch AOC’s speech!! Absolutely gold.
Finally, keep walking the path of compassion and kindness. Do not let him drag you down to his level. You will rise above it. I know things are difficult, I’m in the same boat as you. In the end I would like to look back and know that I did all the right things regardless of how low my H has become.