Because they are so often confused with feral hogs, one may be under the misunderstanding that he is eating hog rather than javelina or vice versa.
I've got three examples/reasons of the confusion:
1. Although not a correct translation, in South Texas, many of the Spanish speakers call feral boars "Javelin" with no "a" at the end - Javelina is reserved for the little animals.
2. My friend killed a sow feral pig and everyone thought it was a javelina until we got it back to camp and I had to explain to them that it was a pig and that there was a difference.
3. Another friend of mine told me that he heard about javelina mating with feral hogs and making a particularly nasty hybrid. I believe that since they are completely different animals that this would be impossible. You can't even mate a human with a chimpanzee even though we have like 98% similar DNA.
I'm no biologist, but I know that javelina were here thousands of years before settlers brought domesticated swine to the new world. Some of these swine escaped and became what we know as feral pigs.
To the best of my knowledge, a javelina is what is called a collared peciary and is closely related to the Rhino and is not porcine in any shape or fashion. However, they certainly look alike with the teeth/tusks and the piggy nose.
One other thing that I thought was funny was at deer camp we were talking about feral hogs and how they can go completely feral in something like 4 or 5 weeks. A friend of mine actually asked out loud whether a human could go feral. People thought about it for a minute and then I said, um no...first, humans are not domesticated animals and second, humans have been shipwrecked on islands for many years without going feral.
As for the taste, I have a recipe for Javelina Jambalaya (considering the foregoing, I wonder if this too is a mixup between the two animals).
This is a javelina

This is a wild hog

On second thought, I see the resemblance.
I've seen a recipe in a major cookbook for Javelina Jambalaya. I have never shot one so, I have never tried to make it. I'm sure it wouldnt be too bad.