They're not anywhere near as common as Silicon Valley's detractors claim, but they do exist. They tend to cluster, which is maybe why you haven't seen (m)any. I

They're not anywhere near as common as Silicon Valley's detractors claim, but they do exist. They tend to cluster, which is maybe why you haven't seen (m)any. I would cite the early Rails community (from maybe 2005 to 2009, but don't pin me down on exact dates) as one that had a very high concentration of "brogrammers", which lead to all kinds of nastiness; most infamously, the deliberate sexism at their conferences. Fortunately, once Rails grew up and put on a suit and tie, they kicked out most of the toxic people and the situation got a lot better... and Rails even became a better framework at the same time to boot. Just one example of the axiom that "rock stars" and "brogrammers" don't actually produce better code.