Way to go extrapolating crass generalisations from one dud interview. Every single dev team I have come across thinks they are the duck's nuts, and the team leads even more so, resulting in embarrassing overconfidence in their own opinions as per your anecdote. I noticed this over the course of a few decades spanning many languages/platforms. I recall my very first graduate programmer job interview in 1989, where I was asked by the interviewer if I defragged my hard disk weekly, and I said no I do it once in a while, and he couldn't let it go and wanted to argue about how important it is to have a regular defragging schedule, wtf, anyway I didn't get the job.