So totally hear you but some stats to add perspective (all from wiki):
~2% of the world has red hair
~2% of American’s identify as homosexual
~5% of American’s are suspected to have ADHD with 90% of them undiagnosed
So if this is accurate then that means roughly one out of every twenty people you walk by on the street has ADHD. Do people over use the term? Yes. Do most people underestimate how frequent it is? Also yes.
Further consider what happens when you give a people who are by definition poorly equiped to restrain themselves social media access and a relatable or spicy topic :p