In your case, I'm guessing lots of people have heard the horror stories of shitty, scammy repair techs in various fields (automobiles being one prominent example). The good ones have to deal with the occupational reputation driven by the worst of them.
For me, I don't consider myself a real expert in any specific subject, but I'm adjacent to a number of financial areas. I try not to delve into the weeds of those internet discussions too often (like I said, not an ironclad expert), and even when I do, it's only to address the most egregious errors. Money can be an emotional topic, and many of those opinions are based on the way people want the world to be rather than the way it is, so show up with facts and references and they tend to understand.