Please die in a fire.

I hate people who try to be overly pretentious when it comes to the English language... like this guy
"How are you doing?"
"Good."
It's called a short answer, and the point is accurately conveyed with the word used. You're just being anal-retentive about using proper grammar. Also, I'm not sure why you're angry about people using "good" in this way... is it because you think they should replace it with "well", like many other people do. Or are you simply upset that they're using an adjective without a pronoun? If you fall under the former, you're simply wrong. If you fall under the second, you're simply pretentious. Take your pick, and be on your way.