1, "You can't eat grapes and say that grapes are sour" is the "sour grape effect", which means that when you feel frustrated because your real needs can't be met, you make up some "reasons" to comfort yourself in order to relieve your inner anxiety, so as to eliminate tension, relieve stress, free yourself from negative psychological states such as dissatisfaction and anxiety, and protect yourself from harm.

2. The story in Aesop's Fable "Sour Grapes" is widely known: the fox wants to eat grapes, but because the grapes are too high to eat, they say that the grapes are sour and there is nothing delicious. Psychologically, taking this as an example, it is called "sour grapes" mechanism or "sour grapes" effect that individuals often belittle their goals and say that they are not worth pursuing in order to dilute their inner anxiety. On the contrary, some people can't get grapes, but they only have lemons, so they say lemons are sweet. This psychological phenomenon is called "sweet lemon" mechanism, which does not say that the goals you can't achieve or the things you can't get are not good, but emphasizes that all the lower goals you have are good, so as to alleviate your inner loss and pain.

3. The mechanisms of "sour grapes" and "sweet lemons" are common psychological phenomena in daily life. It is a typical manifestation of rationalization in psychology. It means that an individual's behavior does not conform to the social value standard or fails to achieve the pursued goal. In order to reduce or avoid the anxiety caused by setbacks and maintain self-esteem, he gives a reasonable explanation for his unreasonable behavior so that he can accept the reality.