story
If you want to build a reddit, you'll never end up with a facebook, that's just reality, the target demo is completely different.
Certainly anecdotal evidence, and I'm inclined to believe the largest user base may still match your description, but personally I feel like you're describing 4chan, not Reddit.
Go compare a reddit technology thread to a youtube comment section. Big difference in writing quality, avg length of post, use of source and data, etc.
You probably outgrew their age demo and realized that smart 18 year olds are still dumbasses.
While I think this is generally a valid point, I also suspect there's quite a bit of When in Rome effect in play. Uninformed r/Technology posters may step their game up to match the consensus style, while informed Youtube users may feel a bit of pressure to dress down.