Who the OP is does affect the prior probability that he is wrong. If the majority of economics viewpoints held by non-economists is wrong (which is a big if), then the commentators would be justified in assigning near-zero amount of credence in what he's saying. If the OP presented a detailed, technical argument in favor of his positions, then this would "screen out" OP's level of experience. But barring such an argument, the commentators may have a point.

That being said, the average internet commentator may not be the best conversation partner.