Commenting with emphasis in all caps is the textual equivalent of grabbing someone by the collar and screaming in their face.
Everyone who does so feels it's justified, but the effect is always obnoxious and it never conveys more information or meaning, only an insistence that the commenter is especially important and needs to be paid attention to.
Very common way people try and "win" on the Internet is by arguing a point not made by the parent. It wasn't all in upper case; your comment is invalid.
Comments by new accounts are autokilled if they trip certain filters that we have in place because of past abuse by spammers and trolls. I've unkilled your comment and marked your account legit so it won't happen again.
Soon, everyone will be able to contribute to unkilling good comments, so fixing these will no longer block on moderator attention. In the future, though, everyone: please send issues like this to hn@ycombinator.com. It's too random whether we'll see it on HN itself! Not to mention off topic.
https://news.ycombinator.com/newsguidelines.html