Please start using your shift keys.
Interestingly, he apparently has been doing so. The original post does contain colons and question marks, which cannot be typed on a normal keyboard layout without hitting the shift key.
It makes me wonder if he's making a statement about our evolving language and its use on-line. I've known people who actively rebel against the tyranny of people insisting on on-line capitalization.
I have to admit, I can be a bit of a language pedant, but I'm starting to pick my battles based on whether the usage variant creates ambiguity by leaving out essential information or warping the meaning. If a variant is easily understood or does something to improve clarity, perhaps it's worth considering.
For example, I approve of "they" and "their" used as singular in sentences such as "A doctor should treat their patients with respect." The "his or her" construction is rather tortured, and if the gender-neutral second-person pronoun "you" can be used for both singular and plural, why not the third-person pronoun? It's arbitrary. And perhaps I bristle when I hear "different than" instead of "different from" but on reflection, I don't know that it matters; the meaning is still clear. When a person uses the term "fail" to mean "failure" there is no doubt about the meaning, so I can accept that. Even text-speak like literally saying "LOL!" (pronounced "loal") instead of "Ha!" when you hear something that you wish to say that you find funny, but not quite funny enough for spontaneous laughter, makes perfect sense. (I have also been known to exclaim "yumyahsel!" at the Dominion table in response to complaints about hand contents when a player has clearly blundered in their trashing/buying decisions. I assume that's roughly the correct pronunciation.)
That said, some things still grate. Many people use the word "random" to describe things that are not probabilistic (or aimless) in any way, shape or form. (No dice were rolled, no cards were shuffled. Maybe it's arbitrary. Maybe it's mysterious. Maybe it's a non-sequitur. Maybe it's senseless. Maybe you just don't understand it. That doesn't make it random.) I have heard text-speak of "bee-tee-double-you" instead of "by the way" which may be shorter when typed, but is longer when spoken. And I will never be able to get over people saying "could care less" when they mean "couldn't care less."
So the question remains: Is capitalization truly important? There is no doubt that it addresses ambiguity when used for acronyms and proper nouns to differentiate words such as "bob" and "Bob." I would also submit that it also reduces ambiguity and improves clarity when used at the beginning of a sentence. Any time a punctuation mark appears, there is a possibility that it represents something other than the end of a sentence (Co., Inc., etc.) A capital letter following a punctuation indicates a new sentence; a lower-case letter does not. Whether to capitalize after a colon is another place where this issue is relevant: You should only capitalize if what follows the colon is a complete sentence. You don't capitalize a list: apples, bananas, and oranges. (Is everyone fine with the Oxford comma?)
My vote is to keep capitalization.
Of course, knowing this crowd, there will probably be edge-cases posted where capitalization creates ambiguity (such as a word at the beginning of a sentence that could be either a regular noun or proper noun, where the reason for capitalization is no longer apparent.)