They're heavily caricatured. There seems to be the implication that this is just how engineers / nerds are. Sometimes, sure, plenty of those people exist. Howev

They're heavily caricatured. There seems to be the implication that this is just how engineers / nerds are. Sometimes, sure, plenty of those people exist. However, in my experience, it's not that widespread. It's way more common for engineers / nerds to be way more socially adjusted, and well rounded. Making a show where the characters embody the worst stereotypical traits of their subjects causes distortion to the point of becoming unrealistic. In my experience only around 1 in 5 or fewer would even begin to approach these extremes; however if you watched the show you'd expect the numbers to be stacked in the other direction.