Well said. I suggest we start quantifying this title.My little sister is an ISFP and might look like a nerd on the outside to strangers because she has a PhD in molecular biotechnology and works in the lab all day infecting cells of the trachea of chicken and turkey with different strands of influenza. She always was among the top of her class in math and helped her class mates with calculus. Her being among science geeks all day wears off and she could tell you a few jokes of the type " a chemist, a physicist and a mathematitian walk into a bar..." Her hobbies are a bit eccentric as well.
But ...and this is a big but... the reason she loves her lab work is because it is hands on research, she loves slicing and dicing cells, using the centrifuge and juggling petri dishes. The theory is just a way to get there. In fact, it worries her that she has become overqualified for practical lab work and might be forced to do more theoretical/paper work in the future And those eccentric hobbies might be eccentric, but they are physical and concrete in nature.
A talent for and/or interest in geeky stuff does not make a nerd in my opinion. Now, my ENTJ brother (marine biologist, major fantasy, role play, dungeons freak, martial arts lover and not a girlfriend in sight at age 25) that´s a geek. But even he is too practical and physical to be a nerd in my book.
Sorry, but the admission criteria of the club should be a bit stricter than that. :P