This is the correct use of quotes and em and en dashes.
Compare the first text to the second one.
"Aja is so cool. She got 2nd in Science in the Academic Decathlon, but really in my view that competition's a scam. But then--I'm CEO of DCScript. I'm also a fan of anti-table layout..."
“Aja is so cool. She got 2nd in Science in the Academic Decathlon, but really in my view that competition’s a scam. But then—I’m CEO of DCScript. I’m also a fan of anti–table layout…”
― Dante-Cubed (Sean3), Wednesday, 21 April 2004 00:31 (twenty-two years ago)