Mothball taste in red bell peppers?

I’m unsure about eggplant. We eat lots of local eggplant from nearby farms in the summer and fall, which hasn’t been refrigerated at all until I bring it home. Only in the home fridge for a few days at most. I never even think of salting and draining the local stuff to remove bitterness before cooking. No need.

The eggplant I buy from the store I think is always a tad bitter, which may a function of age vs. storage?

Always something new to learn.