Humans eat like apes? I'm afraid I must say that I have never, in my personal experience, ever come across this particular event. I'm not saying it doesn't happen, but not in most circumstances.
As i've mentioned, this person is of the royal family. Simply "eat like predators and wash the blood of later" would never happen. Just because they have sharp teeth doesn't make them animals, or even predators. It makes their *ancestors* predators. If you were take this char out of his normal setting and place him into a jungle somewhere, forcing him to survive by any means, then yes, perhaps then he'd become more of a predator again.
I eat with a fork, so the majority of the time, my characters will as well. It's simply the most obvious thing that comes to my mind when I write. My settings are usually very akin to Victorian, if you would. But they are entirely fictional fantasy, and not 20th/21st century. More 16th, perhaps. This character is cultured, as predatory as he may appear. This is why something as mundane as eating is so important for me to get right.
The other character, the demon, is very much a pure, no-holes-bared predatory killer, whose face you'd expect to be dripping with blood afterwards. This character? Not a chance.
If it strikes people as "odd" that I prefer a fork to a chopstick, all I can do is shrug and say "oh well". I would never think to have the prince eat something like jello.