How does irrationalism ignore logic? Can you explain it to me in detail?

Irrationalism is a very general concept, but any philosophical proposition that does not resort to formal logic to explore philosophy can be classified into this concept. Western philosophy has irrational factors from ancient Greece to modern times, and China's whole philosophical tradition can be regarded as irrational. For example, ProTegla in ancient Greece put forward that "man is the yardstick of all things", and he himself gave an example: when a gust of wind blows, some people say it is hot, while others say it is cold, how to give an absolute judgment with reason. Even the concepts of "heat" and "cold" can exist without people? Therefore, man is the measure of all things, not beyond man's rationality. For example, in modern times, Nietzsche said that "God is dead", which means that the philosophical foundation based on the existence of God in the western rational civilization tradition has been destroyed. For example, Sartre, a representative figure of existentialism, said that the world is "absurd", which means that the world can't be guessed by reason at all, and the more people who want to go east, the more inclined they are to go west.

In short, rationalism believes that everything in the world follows the laws of reason, or that it is possible for people to grasp the laws of everything in the world through reason. The similarity of people classified as irrationalists lies in denying the existence of such a perfect reason, or denying that people can understand this perfect reason.