I don't watch TV (just DVDs and Netflix) so I'm usually spared this kind of thing but two things always set me off.
One of them was during an Iron Man film where he invents a brand new element in the periodic table in order to power his heart device thing. He did this by standing on the floor, forming a sphere with his hands and seemingly doing some "oscar winning" meditating complete with every emotion known to mankind. Then after no more than 100 seconds, a new element appeared as though by magic in front of him. I can't remember what triggered more anger - that we were asked to believe he had created a new element in less time than it takes my kettle to boil or that he wasn't wearing any protective clothing for the inevitable highly radioactive emissions which would come from such an element.
The other thing that gets me is seeing either scientific maths on a blackboard in the background or watching computer programs being "run" when all they are doing on the screen is scrolling through source code. My family are sick to death of me using the remote control to freeze the screen until I'm happy that what they've displayed isn't bullshit. 🙂
If I ever see diabetes being mis-represented I'll report back dutifully and let everyone know.