1. Like a hipster
but their interests are all pop culture/mainstream stuff.
2. Someone who strictly follows the mainstream. A vast majority of their interest are mainstream. they pretty much only like things that are popular and don't really have a mind of their own to decide whats actually good or not.
3. Someone that likes what the pop culture tells them to like.
This streamer doesn't have a clue about any of the other cultures of the world.