"Open-minded people, open-minded" refers to an open-minded, frank and direct gentleman. They are frank and tolerant, and do not hide selfishness and intrigue. A gentleman treats others with sincerity, does what he says, does not seek small profits, values morality, values human feelings, treats others with integrity and tolerance.
"Little people are always in the same boat" means that little people are narrow-minded and profound, and they often feel dissatisfied and resentful when they treat people. Small people are narrow-minded, can't tolerate the success and progress of others, often have jealousy and resentment, treat people with intrigue, calculate others, and pursue their own self-interest by hook or by crook.
This idiom means that a gentleman is respected and loved by others because he is open-minded and sincere, while a villain often feels pain and trouble because he is narrow-minded and profound. It emphasizes the influence of a person's moral quality and attitude on others, and shows that an honest and tolerant attitude can win the recognition and love of others, while narrow-minded and profound thinking can easily lead to pain and misfortune.