I’ve always believed that there are people like Rikki Lake, for example, who are psychic vampires in that they feed off of negative energy.
This other thing that you’re talking about. Um, no. Dressing up an black clothes, wearing black lipstick, cutting ones self or another person and drinking some blood indicates some definite issues that need to be worked out, or not. Lots of these people are perfectly functional otherwise. Are they “real” vampires? No. Their hearts beat, all the systems function, including peristalsis. Do you think a “real” vampire farts? I don’t.
You get time with any of these pseudo vampires and wait long enough, they’ll fart. There go all the cool points. Ooooo, Mr. vampire, not so scary now, are we?