Dealing with people like this?? (Long post)

My mother in laws boyfriend has some pretty out there ideas about the world these last couple years and my husband and I don’t know how to proceed anymore. This is a risky post to make since I’m sure there are others with the same viewpoints and I’m really not trying to offend anyone. Please keep an open mind or continue scrolling if this isn’t your jam.

When the pandemic started MiL and boyfriend were terrified, they were extra cautious like many of us were. I would almost say they went a little overboard with the sanitizing routines but I think we all did a bit back then honestly. And then the switch happened, he found a video online, took it and ran. The virus was never real, masks and pcrs were embedded with toxins that were killing us. This man literally cut his pinky off with a saw and refused proper treatment as they needed to run a pcr. The earth is now flat, somewhere the Illuminati ties into all of it. They’ve gotten to a point they have no fixed address, refuse to report to CRA where they are living and won’t pay or file taxes anymore. He even made a joke about taking my son and fleeing to Costa Rica so they didn’t “find us and vaccinate him”. They’re trying to live completely off the radar. There was a random phase where he was sending me videos about what will happen if I get my sons regular immunizations and the inaccuracy of the “facts” in the video were too much. We’ve made it pretty clear we were done discussing his ideas multiple times. Everytime we all got together it was constant showing us his insane videos and trying to convince us to “open our eyes”. We ended up having to ban him from our house and just my mother in law was allowed over to visit our son. She doesn’t believe anything her boyfriend says she’s just also unsure of how to handle it all and goes along with it.

He’s been tagging along with her for visits again lately (not invited he just shows up) and he saw that I have a new Fitbit sense. I don’t think I likely need to explain where this is going, but he lost his marbles when he found out it uses gps and went OFF about how dangerous it is for me and the government is watching my every move. He then takes it as far as questioning if I’m a good mom because it’s putting my son at risk for something so selfish as tracking my steps. I’m like WHAT, I literally almost told him to gtfo of my house.

I’m trying my best to be respectful but I can’t do it anymore. I’m vegan, have been for more than half my life and I can promise you I don’t go up to people all day and start spewing sh*t to them. I really don’t care if people don’t share my viewpoints at the end of the day as long as we’re all civilized, so this preaching thing never sat well with me. But this man is relentless and insists he’s only doing it because he’s so compassionate and cares about the people in his life so much he loses sleep over it and he needs everyone safe so he can’t help it.

How would you guys deal with someone like this? Banning my MiL from the house isn’t an option but this man can’t seem to get the idea that he’s not welcome too if he can’t be civilized. I’ve been trying to be nice this whole time, smile and nod but I can feel my inner bitch boiling to the surface, it’s been almost 2 years of this.

Update: My sincerest apologies on the use of slang. I’m just horribly horribly stupid, ignorant and had no clue.

We’ve made it pretty clear to MiL he’s insane and needs professional help but she insists “he’ll be fine”. So maybe cutting her out for a while as well is the way to go. Thanks for the input you’ve all had so far