femented fruit & vermicomposting

usually on the internet it says that worms prefer decomposed over fresh food but on a youtube video one worm farmer said that it is possible for food scraps to rot too much for the worms liking. How do I know when it has decomposed too much?

also what is the deal with fermented fruit, do worms like it or nah? how do I give fruit to my worms and not have it ferment?

Redworms do not have teeth, so they MUST wait, till the food starts to decompose andy liquify by the bacterial activity. If the food (foodscraps etc.) is haevily compressed, soaked with too much water, simply without the access of the air, anaerobic decay occurs and this is not good for redworms.. So it is better to mix the food for them with some "fluffy" materiál (leaves, hay, straw, paper etc.). No problem feeding worms with fermented fruit - some wineries are vermicomposting grape marc very successfully..

There is a difference between "decomposing" fruit and "fermented/fermenting" fruit. Decomposing involves the fruit being broken down by various bacteria. Fermenting involves primarily the sugars and turning the sugars into alcohol. In a worm bin, fermenting happens when there is a lot of fruit, and the temperature is warm. The same amount of fruit might not ferment if the temperature is cooler or cold, it will more  likely rot or decompose before it ferments. If you have a lot of fruit in your bin and it's fermenting, try to spread it out to allow any alcohol forming to escape and to encourage rotting instead of fermenting.