Typing too fast and making folks strain to read it at high speed would be rude. Typing all caps is shouting and I think, some rude and difficult to read. Typing all lower case isn't so rude but some ignorant. Anyone remember Archie, the cockroach, that typed all lower case because he couldn't reach the shift key at the same time as a letter key? Cockroaches are great survivalists but not noted for intelligence. Pretty funny the Biblical typing, seek and ye shall find or a more modern translation of the good book, look for it and you'll find it, dude.
Me, I'm a graduate magnum *** nauseum of the Christopher Columbus school of touch typing where you look for, discover, and land on the keys one at a time. Most folks know that the "qwerty" keyboard was laid out anti-ergonomically to slow typists down, right? With me, It works fine, I'm real slowed down on the keyboard.
Patrick