Why do people look down on each other?

There is nothing we can do about it. This is handed down from our ancestors. Scholars despise each other since ancient times, and photography can be regarded as a cultural person who engages in art! In addition to ancestral genes, photography has some unique reasons for photographers to look down on each other. Of course, not all photographers are like this, but there are some so-called photographers, mostly QQ groups and website communities. When someone shows a movie, there is a problem with how to shoot it in the early stage, and it is said that you have a problem with how to tune it in the later stage. Isn't there a new term, keyboard photographer? It's such a group of people. Other people's movies are rubbish, and I'm the only one.