The 'sour grapes' origin story comes from Aesop's Fables. In the story, a fox tries to reach some grapes but fails. Then it says the grapes are probably sour anyway. This phrase is now used to describe someone who dismisses something they can't have as not being desirable in the first place.
The Sour Patch Kids story began with the idea of making a unique candy. Candy makers wanted to create something that had an exciting taste. So they came up with the concept of Sour Patch Kids, which started out sour and then turned sweet. This was a new and different concept in the world of candies at the time of their creation, and that's how the origin story started.
Well, in 2020, the Sour Patch Kids' holiday story could have been centered around bringing their unique sweet and sour taste to the holiday season. They could have been included in holiday gift baskets, or perhaps there were some fun holiday commercials featuring them. Their sour then sweet nature is always a hit, and during the holidays in 2020, it might have added a special touch to family get - togethers or individual snacking times.
The moral is that people sometimes pretend to dislike things they can't have. Just like the fox couldn't reach the grapes and then said they were sour.
The 'the grapes are sour' short story is about a fox who tries to reach some grapes but fails. Then, instead of admitting his inability, he says the grapes are sour. It's a fable that teaches us about rationalizing our failures by devaluing the things we couldn't obtain.
The Sour Patch Kids are soft, chewy candies. They start out sour and then turn sweet. The story goes that they were created as a unique treat. They became popular for their distinct taste experience of the sourness followed by the sweetness, which is kind of like a fun little journey in your mouth.