Yeah that attitude will not get you far in life unless you're Steve Jobs, and it'll sink your ship unless you're obnoxiously rich. And even if you're either/both of those things: A. you can and should act better, and B. people will always attach an asshole-asterisk to your name for the rest of your life and probably even a good while after.
Exactly. In my 25+ year career, I've encountered maybe two dozen or so people whose e-mails and chats were terse, yet admittedly succinct, one-liners and most of them were also raging assholes to work with. The ones who also didn't use capital letters or punctuation in their communications were uniformly assholes.