No, that's not even sort of what I said. The fact that there is no inherent source of truth to compare to does not give license to idiotic takes. It doesn't invalidate people pointing out that an opinion is idiotic. It's simply an acknowledgement that multiple intelligent opinions are possible.
There's inherent uncertainty to everything, down to such an extreme level that predicting individual particles' behavior has to be probabilistic. The existence of that uncertainty doesn't prevent some statements from being stupid and wrong.