Being a person who enjoys satire, I was quick to pick up the humorous intent in the piece.
However, I did not find this story particularly compelling. I initially thought it was because I am an introvert and this was poking fun at the personality type while failing to adequately tie the genuine characteristics of introversion to the writer's "behavior".

Then I realized the problem is, the context is missing. At the time this piece was written, 2016, "affluenza" boy was sentenced to jail time after getting in trouble/being intoxicated while on probation for his earlier vehicular homicide charges. Hot topic at that time was the use of lame, mental health fabrications for doing something awful. Taking that into account, the satire made sense and would have been relevant and perhaps funny at the time.

If the article is NOT satire, and I profoundly hope that it is, then the author is an asshole AND (perhaps) an introvert. Being an introvert doesn't give anyone the right to treat other people badly. And it's total BS to think that the personality trait of introversion entitles one to behave like a consummate jerk.

"As an introvert, I hate donating money to charity. I’m just too shy to think about my money going to help some stranger."

I was going to use this line to say that the author is actually an asshole, but then I kept reading. I believed it was serious until I got to the part about mixing up the roomate's food and smearing it into messages. Then I realized that the author was actually making fun of introverts and now I'm mad. It's rather stupid.

I understand it's satire, but I'm not sure what the point was.

Seems like a rather silly article to me. It demonstrates that, as someone else said, introverts are not all the same. We come in lots of different flavours and some are idiots.