The comic made me chuckle; but why has introversion become synonymous with being anti-social or asocial? My understanding is that it's entirely possible to be highly social and introverted, because being introverted just means you gain energy from being alone. It doesn't mean you hate social gatherings or don't like having friends; it just means you discharge when socializing and recharge during alone time (and the opposite is usually true for extroverted people).
I wanted to point that out as I seem to be a social introvert. I like socializing and love being invited to things (even if I'm not available or it's something I don't like doing, because it means someone remembered that I exist), but my battery wears out fairly quickly when doing so. Strangely, I used to be very extraverted, but at some point I swapped to being introverted.
Edit: I guess I will say that the thing the comic gets right is that usually I won't hold it against someone for cancelling. However, I don't get excited about it, and might even be disappointed if it was something I was looking forward to, but I usually am okay with it.