I'd say celebrities and creatives in general are often big offenders here too. Lots of actors/athletes/musicians acting like being good at what they do means they're also qualified to talk about science and engineering. And a lot of reviewers, documentary creators and specialist writers that decide to wade into discussions about topics they have no knowledge of/cover something they're new to, only to look ridiculously out of touch as a result.

See the Nostalgia Critic review of the Wall. Or the Alex Meyers review of Obsession.

Or all the celebrities who write children's' books.