There are some people who, possibly because they feel insecure, adopt a "blind them with science" approach. No-one with a real understanding of their subject would do that.
I think there is also sometimes too much respect given to someone with a PhD. When we were young that was quite unusual and signified an expert, if not an intellectual.
There has been such a proliferation of degrees and commensurate dilution that you can now come across PhDs who would not have ever been considered particularly bright in a previous generation.
Baby Reindeer - anyone watched it?