Go back and look again, and I think you will see who is playing the know it all, now. I answered LA much the same as you. To his question
I replied
I didn't say what you made was caponata, but that it can be served with toast like a caponata. And, of course, it is made with eggplant.
Now, since you already responded in a reasonable way to LA about this very issue, you might have responded in a similar way to me. But as happens so often, you chose to be a prick. You should expect some blowback from that kind of attitude. There are few things worse than a bully who whines when confronted.
I imagine you were a real joy to work with in the restaurant.