No need to rely on anecdotes though. According to San Francisco’s Controller’s Office, a little over 6% of the population work in the tech industry[1]. That is an unquestionably small minority of the overall population.
If the people you have met predominantly worked in tech, it is likely due to a bubble you created yourself. Perhaps, for example, the majority of the population outside of tech cannot afford to spend time at those coffee shops and restaurants?
[1] https://bits.blogs.nytimes.com/2014/03/20/why-san-francisco-...