Buddhism has no castes. The rejection of the Hindu caste system was one of Buddha's objectives.
First of all, we'd have to consider whether or not the Samurai (Japanese) paid any attention whatsoever to the writings of Confucious (Chinese). If they did, then we could say they rejected Confucianism probably because the Samurai were very militaristic by nature - kind of like the U. S. Marine Corps of ancient Japan. Confucianism has little that is militaristic or aggressive in any aspect of it's teachings. The Samurai likely looked at Confucianism as "wimpy" - if they looked at it at all.
guessing ure from clements
They were racist
They were racist
They were racist
They were racist
They were racist
They were racist
Most people who aren't Buddhists reject it - for example, most Christians, Muslims, Jews, etc.
because the founder of buddhism Siddhartha Gautama thought it was cruel
As a Chinese, Qin Shihuang was the first emperor of China, and the Qin Empire he founded was also the first feudal dynasty in Chinese history. It was the beginning of the Chinese feudal dynasty, and it was a very powerful empire. The policy of Qin Shihuang, the leader of this country, was called "burning books and burying scholars" in China, which meant to reject those nothier people and things