It is, at least in the Valley amongst the get-rich-fast crowd, which is not a small portion of the people working here.
There are a lot of things I don't like about the tech culture in the bay area, and this everything-but-unicorns-is-trash attitude is close to the top of the list.
It's certainly part of the culture but when you make 6-figures a month as a bootstrapped founder, those arrogant a-holes quickly quiet themselves. Most of the fellow bootstrapped founders I've met are pretty decent people and there are a lot of them. I found the old money east coast elite to be much more annoying and far less interesting.
There are a lot of things I don't like about the tech culture in the bay area, and this everything-but-unicorns-is-trash attitude is close to the top of the list.