Well, so long as you didn't do or advocate anything illegal, the reasonable response to false claims is evidence-based true claims (that appeal either to data or the reasoning itself). I'll admit that some forums have a problem with newcomers rolling in with the same problematic claims all the time, but those cases deserve a stickied thread or other pre-posting reading list to head off these problematic topics with facts or at least an explanation of the situation.
Irrational resistance to claims about the dubious utility of some cases of captive UVB provision isn't unique to Reddit, but the fact that such comments get disappeared makes useful online "research" best weighted very heavily toward peer-reviewed publications (which publish negative and positive findings equally).