I'd say NewGrounds users can be divided into three classes:
Class 3: Immature dumbfucks who make threads about high school drama, sex, "girl problems" and "funny" videos. They tend to be 12-15 years old, but there are exceptions. These people can be accepted by others in Class 3, and they can keep peace with Class 2 most of the time, but they are usually intolerable to Class 1. They usually leave the BBS after a short period of time, but they may mature to be promoted to Class 2.
Class 2: These people may have more maturity than class 1. They can occasionally be annoying, but they are a step above Class 1. They can get along with people in all classes most of the time. Most NewGrounds users are in this Class.
Class 1: Intellectuals, "geeks", etc. These people tend to be older than those in other classes. They tend to have discussions on deeper, more complex topics. Their posts tend to be longer, more organized, and more insightful. They can be narcissistic or elitist, and they can be targeted for flaming often, especially if their topics of discussion are controversial.