I posted on here a while back about a friend - now a former friend -- who I believe had some kind of a mental breakdown (or, more likely, was unwell for a while but it wasn't that obvious) and started thinking she suffered from a disease that is being 'hidden' by 'corrupt doctors' and spread through chemtrails and crazy s--t like that. I've been gently trying to tell her to visit a psychiatrist and start meds but was called every name in the book. I just told her to have a nice life and cut her off.
From what hear through the grapevine, now that Covid hit, she abandoned her 'mysterious' ailment and is spending her days on the internet with covid-dissidents fighting 'the system'. They are against masks, treatments, vaccines and blame Bill Gates and illuminati for everything that's going on. You know that this vaccine has some liquid chip installed in it that will track everyone down wherever they go, right?
OP, I guess my point is, you get to decide what level of crazy is acceptable or not acceptable for you. Then you act accordingly.