Comment by lmilcin

There is certain need for people to be able to simplify problems in terms that they can understand an manage.

This is necessary, because humans have very limited capacity to understand world around them and otherwise it would not be possible to make informed decisions, as gathering all relevant information would necessarily take practically infinite amount of time.

From that point of view I understand people like your professor is mostly result of bias also called Dunning Kruger effect. This is basically lack of education in a given area. You need at least some knowledge in an area to be able to appreciate complexity and unknown unknowns.

If you don't want to be that guy, the best medicine is first to learn to be self aware, second to be aware of various biases (including Dunning Kruger effect) that you are subject to and third to get some knowledge/experience in an area you are trying to make decisions in.