>>81527569 (OP)It can be a symptom of narcissism. Narcissists are often about image and narrative, they have an idea of the perfect 'other', someone who makes life the way they envision it in dreams. The other is pretty and fun and enjoys all the same things.
No one can ever live up to an ideal so if you ever start dating someone then any deviations from perfection will be magnified and you'll hate them. If that ends up badly affecting your life then it becomes a disorder, but narcissism is a necessary part of a functioning psyche cos it protects you from ego harm. Healthy narcissism is thinking "well, I'm better than them so I can ignore their criticisms" when someone insults you. Unhealthy narcissism is when you hate yourself so much that the only way to protect your ego is to rank everyone below you (even if it's only on a single trait like weirdness, looks or talent at drawing). The best relationships come from people who are happy by themselves, the other person is then just a bonus to their life.