Interesting in this context is completely divorced from morally good/bad. Could be any group from any area at any time in history. I’ll start with a few, followers of the cult of pythagoras, contemporary black Hebrew Israelites, antiracist skinheads and the Amish (neo-luddites in general). Don’t be racist or a prick to other people discussing.
They have an illness destroying their life (even if it’s not the one they think it is) and they’ve found a medication that actually makes them feel better. Everyone tries to take this medication away (antibiotics) without providing anything else effective in it’s place. It’s understandable why they’re hostile.
CFS\Long Covid isn’t solely psychosomatic in the cases where an illness triggered it, that’s autoimmune.
There’s no good options for them right now outside of social support, but they certainly don’t get that in my country either. So I get why they’re absolutely hostile and just leave them be.