You can prefer one spelling over another, absolutely, but it's a bit too strong to say someone using the actual word "lead" is incorrect.
Oh, I wouldn't correct someone for saying "lead" -- or "intro" or any other variant that makes sense. Leed is right out, though.
Oh, I wouldn't correct someone for saying "lead" -- or "intro" or any other variant that makes sense. Leed is right out, though.