It literally says that what we evolved was a system that can learn that something is bad via society like eating dogs and horses vs eating pigs and cows. The pig eaters and the dog eaters aren't overriding anything, because they didn't learn it in the first place.

It invalidates it because you're saying disgust is evolutionary. The response is saying it's largely cultural, thus something that triggers disgust is not going against some "evolutionary truth" but is rather just another learned behavior.

If it's purely cultural and has no connection to reality then it should have "evolevd out" of us. But it hasn't. Being influenced by culture is part of how the system works. The reason you learn disgust is you can't afford to learn by trial and error so you outsource to society.

Now if you think you're a smart ass and decide to "override" the cultural "indoctrination" that makes you find insects disgusting, what do you think is the likelihood that you are the one who is right?

In all likelihood you will find out after some time that you made a huge irreversible mistake.