Do a quick scan of the post you're replying to for the words "agree", "disagree", "contrary". You'll notice that the content of the discussion is never mentioned.
It's all about tone. Disagreement is central to conversation. Sadly, it's also central to being a dick, so you have to take care with how you come across. If you think of yourself standing with a beer in your hand looking a group of people in the eye, you'll probably do a lot better here than if you imagine you're on the Official Internet Review Board for Startup Execution pronouncing your verdict.
It's all about tone. Disagreement is central to conversation. Sadly, it's also central to being a dick, so you have to take care with how you come across. If you think of yourself standing with a beer in your hand looking a group of people in the eye, you'll probably do a lot better here than if you imagine you're on the Official Internet Review Board for Startup Execution pronouncing your verdict.