The phrase "special snowflake" is used to describe someone who believes they are unique and deserving of special treatment. It can be used to criticize people who think they are more special or important than others. Full definition
Dunlop said, «I know we all feel like special snowflakes with our book, but you want your book to be like other books. (janefriedman.com)
It's frustrating having so many charging standards at the same time that we are transitioning from microUSB to USB Type C, but at the very least we get to see them become more useful in their own special snowflake way. (xda-developers.com)
During Winter in Animal Crossing: New Leaf, when it snows special snowflakes will fall with a sound effect occasionally. (animalcrossingworld.com)