I think social hacking is far harder than trying to find vulnerabilities in a public server. It requires a whole different set of skills -- and I don't view it as being a "soft skill".
Kevin Mitnick was a social engineer primarily.[https://secure.wikimedia.org/wikipedia/en/wiki/Kevin_Mitnick...] Thus, him calling anyone 'not a real hacker' as in the context presented in the article is ironic.