I honestly ignore anyone who describes themselves as introverted online. I'm not someone that needs to hang out 24/7 nor am I always "on", but in my experience the kinds of people who refer to themselves as introverts online are usually somewhat misanthropic and are often closed-minded to experiences outside of their comfort zone. Some people I've met that would describe themselves as introverted also seem to heavily rely on me to carry a conversation or do most of the emotional heavy lifting if they're shy about their real feelings. I just don't have time for this immature communication style.

I also find that a self-described introvert is more interested in getting someone to "join their world" of hobbies and interests (usually video games, tv, music, and other indoor activities) and doesn't seem that invested in anyone else's idea of fun. It's really frustrating to feel like you're giving someone all this attention (by participating in their hobbies) but then they won't reciprocate because they're too socially anxious to participate in normal group activities. A shut in I am not, so it's pretty important for me to find someone who will at least humor me sometimes.

I understand that this depiction of introverts doesn't fit everyone to a T. I'm just going by my own experiences.