when you type as fast as i do, combined with the fact that i keep long nails and have some joint issues, i would kindly ask that my lack of shift-key use be overlooked. there's only so much a girl's hands can do, you know! ;)
Punctuation wasn't developed to torture or punish, but because it increases readability and comprehension. Not using punctuation decreases readability and comprehension and requires greater effort on the part of the reader, so you the writer can make less effort.
That you can't be bothered to standardize your communication says that you care more about your own convenience than that of others, which is epitome of bad manners.
Proper punctuation is really just consideration for others.