The problem with talking with specific attention to grammatical or syntactical correctness in some cases is that it can come across very bluntly, condescending, pretentious, etc. in the wrong context. Obviously, we're assuming a casual internet situation here where less formal typing styles are accepted.
if you type like this, you take down some of the connoted tone of intellect, though can tend to also gain the connotation of unlearned-ness. it's the exclusively written equivalent to casual diction tone. this sort of typing also makes it easier to transition to entirely joke statements or use shortened language without looking completely idiotic or sarcastic
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