The Special Snowflake (Also referred to as one with the "Special Snowflake Syndrome" or "SSS") is a person who believes they are different and unique from everyone else because of something there are or do. This thing they are or do, most commonly is something is something many many other people are doing, E.G. Genderfluid, Therian (Otherkin), etc. Special Snowflakes almost always have a superiority complex.
Some Special Snowflakes are protesting at Target because they aren't allowed to wear their costumes inside.