Enter Emanuel Derman:
But what makes me angry about this tweet is not that Emanuel Derman is wrong. It's that he attempts to define the identity of tens of thousands of individuals with one conjecture. On Twitter you will find scientists in every field, of every race, of varying ages and beliefs. Bad things happen when you generalize identity, and it's even worse when you try to define someone else's identity. I am a scientist and most of the people I follow on Twitter are scientists. So how does Emanuel Derman define scientist, I wonder? Is it someone actively doing research? Someone with a published paper in the last N months? A Nobel prize winner? Someone with an active R01 grant? Someone that is in a lab this instant discovering something? With each and every one of these - on just about any given day - you will find someone on Twitter meeting the requirements of a scientist. Emanuel Derman's conjecture quickly becomes a "No True Scotsman" fallacy (thank you, @jfreebo).
Conjecture: If you're making a statement about someone else's identity you're probably wrong.