First, the center of learning mathematics is the pain center of the human brain. In other words, feeling pain like acupuncture and processing numbers are the same area of the brain. Some people have a headache as soon as they learn math. This leads to people's natural avoidance reaction to mathematics. The more they escape, the harder it is to learn.
I have met people who practice calligraphy, learn to dance and write poems in their spare time, but I seldom see people who study mathematics in their spare time.
Second: the field of mathematics is very extensive. Most people don't know where to start.
Third: the symbols of mathematics are chaotic. This is the main point of this paper. It is difficult to learn because of the chaotic mathematical system. To learn mathematics, we must understand what all kinds of confusing symbols mean. If people who have not been exposed to mathematics see those symbols, they will be amazed.