There's a certain subset of people on the intersection of high IQ, high-functioning ASD and LGBT that produces a lot of high impact activity in STEM fields.
There is no comma between ASD and LGBT, so I would assume that user is making an "eats, shoots and leaves" type joke where the humor comes from the concept of high functioning LGBT rather than an already existing assumption that sexuality and gender directly affect one's functions
I heard from a psychologist that homosexuality is associated with higher creativity (possibly explaining why it wasn't eliminated through evolution/natural selection). That seems true in art anyway, but I am not sure if in science the flamboyant online profiles simply make them more memorable characters or if the association holds.