TIFU trying to have idle conversation with my supervisor

For about a month now I have been working at a DNR conservation farm. Specifically, we raise and release pheasants as well as manage the property and groundskeeping. My supervisor is an acquaintance I've known for years but never spent much time around, for what will become obvious reasons. Every attempt to have any conversation with him has spiraled into an opportunity for him to rant about "libtrds", "millennial pssies", and "goddamn Democrats giving lazy people free shit". He thinks Trump was the best president since Reagan.

Today, tempers flared because we are moving thousands of reluctant birds into their outdoor pins. His agitated state continues to build up as we work, assisted by a female coworker and his two young sons. The conversation wanders to out of control schools and how "they should bring back the paddle".

My 1st F up: mentioning that the decline in our school system coincides with the cuts in funding under GWB and that we should reallocate some military spending to improve schools and educator training. At this point he's screaming and foaming at the mouth and said "libtards will just use it to give N*****s more free shit"

My 2nd F up: I stopped immediately and threatened to "knock his teeth down his throat" if he said it again. I walked off and sat in my truck for two hours to calm down.

My 3rd F up: I thought once we had a chance to calm down, we'd talk it out and I would explain my boundaries. He immediately explodes again after finishing a call to our headquarters. He gives me a patronizing half assed apology and says he'll never use that word at work again.

My 4th and biggest F up: I sent an email to our headquarters explaining the incident, admitting that I threatened him as I walked away.

TLDR: I threatened my supervisor for using a racial slur and probably got us both terminated