Why do some people have to point out every little thing you type wrong?

I made a status on facebook from my phone, and I type really fast and on a phone, you tend to make a lot of typos. Anyway I don't feel like going back and correcting every little mistake I made. Then this girl had to point all my typos and type them the right way. I commented back, "Seriously, get the hell over it, who cares." Then she got all mad.