Introverts by definition prefer alone time because it is what stimulates them as opposed to an extrovert who becomes energized by social situations.

If you are going getting your panties in a twist because people are different to you, then you are the "prick" with the problem.

" I really disagree that there's any real trend towards looking down on being introverted. If anything it's grossly encouraged, with reddit and Tumblr basically being big back patting sessions for shyer people who like to stay in their house a lot. "

Utter tripe. The real-world is much fucking larger than the userbase of Reddit or Tumblr. I suggest you read Quiet by Susan Cain if you want to actually understand this topic and speak with authority on it.

Pretty much every introvert in the world has at more than one point, had to listen to a condescending putdown, typically in a group social situation that goes something like the following: "you're so quiet, why don't you talk?"

I don't see introverts calling extroverts mouthy pricks; we just get on with our days and accept people are different from us. I suggest you do the same instead of bitching because people are different to you.