First you would have to assume or prove that chestnuts have sentience. (the ability to experience feelings and sensations)

Next you would have to assume or prove that chestnuts have potential. (The inherent ability or capacity for growth, development, or future success. )

Then you would have to assume or prove that chestnuts have agency. (the capacity of individuals to have the power and resources to fulfill their potential.)

Then you would have to find a group of chestnuts that have all of the above but doing nothing to reach their potential. While also ensuring that there are no impediments in their environment or upbringing that are constraining them or holding them back.

Then you could, credibly, accuse that particular group of chestnuts of being lazy.

Maybe they’re like a $2 epileptic sloth