I think this case is more specific than that: expressing personal experience as something that must therefore be true for everyone often gets you downvotes, at least here, unless you experience agrees directly and completely with local group-think (and even then some who disagree with the local group consensus will downvote without explanation).

Frame personal experience as personal experience that might inform others usefully, rather than framing personal experience as solid undisputable globally applicable fact. You'll likely still get some downvotes of course, no matter what you say or how you frame it.

"Trust me, it never helped me" is entirely different.