1. Reduced stigma led to more diagnosis and less hiding
2. decreased socialization and internet escapism increased the percentage of the population exhibiting these symptoms and aided in self diagnosis
3. people like to make groups to simplify their world and feel a sense of belonging, see: astrology, personality quizzes, omegaverse, sports

Its a big complicated mess with no clear answer. We all do exhibit these feelings to a certain extent, the magnitude and ceiling for our ability to cope and adapt to them however feeds our definitions, yet everyone can look at this and feel a little but of ourselves.