Rockstar disease

Rockstar disease is an illness of the soul and mind. Those most likely to develop it are celebrities or singers who are not as famous as the top stars. Rockstar disease seldom affects those with high status as these people know their influence, are confident in their skills, and acknowledge they would not have gone as far as they did if their fans hadn't believed in them. In contrast, lower-class stars do not, thus developing a superiority complex. They regard media, fans, family, and friends as mere human beings, while they believe they are God. Nobody likes celebrities with rockstar disease, and it never takes long for people to discover that their favourite person has changed into some monster. Rockstar disease always shows through. And it is dangerous—both to the celebrity and those that love them.

Example 1: Hey, I think Kevin has rockstar disease.
Example 2: So you've noticed?? Been telling you that for years. Fame changed him.