You have been told wrong. I am a Ph.D. in Psychology. What you have been told, possibly, is that these are deemed incurable. In other words, as far as a practicing therapist is concerned, these do not exist. As abnormal personality traits, they very definitely exist.

I am an inventor and a scientist. You can believe what you want. Elon is a great inventor. It's is the same as saying that Steve Jobs is not an inventor but a marketing guy -- which is not right at all if you knew him. Same for Howard Hughes. And many others, including Thomas Edison and Henry Ford among many others.