Bitter Eggplant?

What does eggplant have to be bitter about?
Could it be the way that so many get smoked down to a little bowl of baba ganoush?
Or perhaps the unjustness of its reputation as less than marvelous in any way?

Or - maybe it's the common misperception that all eggplant are the same, which this display clearly refutes (without even showing several more varieties commonly found in farmers markets here).