I might be over-analising, but I think it's because people like feeling better than other people, and this becomes more and more blatant the smarter (anylising?) and smarter someone gets (not true in all cases), and there is (hopefully) a point where they realise that doing that can make them seem (analysing?) like an idiot (different for different people), but language is a pretty fundamental part of our society, and an opportunity to prove that "UR DOIN IT WRORNG!" can be a bit too tempting for some people. On the other hand, if someone has made it very clear that they don't know how to spell a word, a helpful poke probably wouldn't be unwanted.
...
Or maybe I have no idea what I'm talking about.
(Anilising?)
...
Or maybe I have no idea what I'm talking about.
(Anilising?)