First, because most houses with wooden tenon-mortise structure in ancient times depend on carpenters whenever they need to build houses and add furniture, it can be said that life is man-made, so how dare they offend others? If the carpenter tampered with the house, the consequences would be unpredictable.
Second, because the carpenter's ancestor Lu Ban (of course, he is not a medical master Lu Ban), it is said that he handed down a book called Lu Ban Jing, which contains many Feng Shui secrets. Of course, it is impossible to have a copy of this book. Therefore, the skills taught by carpenters are all handed down by word of mouth and taught by hands. The theoretical knowledge is not good, and the disciples must practice hard. Because people only know this mysterious book, but they don't know the contents, and only the carpenter knows it, which invisibly increases the carpenter's mystery, so they are afraid of doing something bad when they work for themselves after offending the carpenter.
Third, there is specialization in the art, and the working principle of carpenters is unknown to anyone except myself. Coupled with some superstitions of the ancients, the carpenter profession is even more annoying. There are even some legends that carpenters' tools can ward off evil spirits, and all evil spirits will not violate them. In addition, these remarks make people even more afraid to offend carpenters. In ancient times, some evil gentry often defaulted on the wages of workers, but never dared to default on the wages of carpenters. In addition to not defaulting on their wages, they also provided them with delicious food, fearing to offend them and let carpenters build their own houses indiscriminately, from disaster to death.
Therefore, in ancient times, people treated carpenters well for the stability of their houses and the durability of their furniture, and also for their own lives, which is why the social status of ancient carpenters was very low, but people did not dare to offend him.