Sacred Haven of Debauchery

They are often interconnected. But in general, people, despite being largely the same, are different. I have acquaintances who fit your theory, and those who don't. Observations are subjective.

Yes, just like everything else: you can't simply divide society into templates, saying that some are nerds, others were, others are schoolkids, etc. (or "and so on," as you like). The point is that everyone is an individual and may possess traits that characterize belonging to 2 opposing groups, so there's nothing to say about breaking the templates. So, I would advise being more considerate when labeling everyone with the same definition of "nerd."

However, it is worth noting that individuals, when united in small groups, blur their status, so someone may rise on the social ladder, someone may fall, and in the end, we see one averaged face of the group.

the news showed a forum for pedophiles, I should tell Wolf about it

He's not a pedophile, he's a good guy.