My humble opinion:
If I made any conclusion of what BBT does put down. It would be the average"joe'. Several times the show has illustrated how ignorant some people are. Particularly Penny's ex boyfriends. They have been the target of the humour.
To make a show funny there is nearly always someone to be laughed at. Someone who is the brunt of the joke.
I respect your opinion Alex. However I don't entirely agree or disagree with it. The BBT show aims at anyone on the set who may present a comical character. After all it is just a comedy and not much more apart from the clever scripts. I like the show for its intellectual stimulus.
As for incompetence among scientists? Well, I have another thought on that. When I was a senior tech in charge of a military workshop, sometimes I asked an apprentice for advice on a particular equipment. Some apprentices had experience that I did not have. I was not deemed to be incompetent. I was still respected for what and who I was.
Being a geeky scientist is not a bad thing these days. My daughter wants to be seen as a geek. Her friends same. Many youngsters these days want the title, 'Geek'. Why? Because they are successful