Why do people get mad when DPS is posted?

[Poisenbery]

Are you upset that your incompetence is being pointed out?

EDIT:
It seems to me that the biggest gripe with posting DPS is the fact that most players get very upset if they're not #1

Not everyone has a DPS build. It's perfectly acceptable to have low DPS, but getting upset over that is petty and immature.

Edit2: Insulting someone for having low DPS is completely unacceptable. That is not what this post is about. I was talking about POSTING damage numbers, not being an ♥♥♥♥♥♥♥ about them. Major difference.