well there are two things here:
1. Being uneducated and being inexperienced (usually remedied with age)
2. Being a dumbass (there doesn't seem to be a cure for that, regardless of age/experience/education)
Of course, when you combine these two items, you usually have a problem you'd rather avoid.
So I don't think that the word "mentor" has anything to do with it. There are some really excellent mentors on the site who have helped people learn the basics during the life span of CC.com.
There may be some people who are good teachers on this site, but 100% of the time, someone who posts up using a variation of the phrase "I'm looking for a mentor" is sketchy and best avoided.