This has always been the case with the massively wealthy. They may be incredibly smart in their specific line of business, which leads them to an enormous amount of wealth and fame. Because our culture likes to lionize success stories, we collectively lean hard into putting people like that on pedestals and giving them more opportunities to speak their minds. Their own egos get inflated as a result, and a feedback loop ensues - they think everything they do is great because, collectively, our culture wants everything they do to be great.

But the simple fact is, nobody's a genius in all areas. We all have our areas of expertise, but none of us can be trusted to speak wisely about all things all the time.

At the same time, as others have said, your BS detector has matured.