When looking at resumes and job applications of other philosophers (I'm finishing up a Ph.D in philosophy) we often make fun of the ones that list way too many areas of competence. At a certain point, there's a worry that anybody who thought they were competent in that many areas might not even know what competence is.
Yikes. That's pretty hard-ass. I'd just assume the person was full of shit about what areas they were competent in. It hadn't even occurred to me they might be full of shit about the very idea of competence.