Reading that shit was pretty confronting for me actually, I felt like I did reading a sheet from my psychologist about SAD...and you feel like an idiot for not having done anything...anyway. I do sometimes doubt my Enneatype; after all I don't have a gift with language, and I'm not that pretentious or vain. But then again, that's just me comparing myself to the descriptions and beating myself up for not being like the others (while secretly feeling pleased that I defy the norm). This is all typical behaviour for a 4, if an unhealthy one.
So going back to what you were saying, I wouldn't be put off any type by how other people behave. Walking stereotypes of a type are rare, so it's best to take the descriptions with a grain of salt.