I suspect that the main reason for attitudes towards non-technical people is due to a wide distrust of "business type" guys. I think coders often have a great amount of respect for product designers, UI/UX folks making wireframes, .. or anyone who shows some capacity to actually make something, for deep thought & creativity, or to articulate a convincing & unique vision.

The greater myth is that "technical" people must lack "soft" skills. If you go beyond anecdotes, software engineers on the whole are more likely to be married & enjoy happy marriages, less likely to get divorced, have long lasting friendships, communicate honestly & care about others, are more likely to be engaged in politics and charities, etc. etc.

Likewise, engineering & building large software systems together (or any machine of complexity...), requires a great degree of communication & cooperation, thus it is no surprise that software engineers on the whole are actually pretty engaging people & have good communication skills.