Maturity is recognizing that ninety-eight times out of a hundred, there actually is nothing you can do, because nothing you do will change it. Getting angry means you're letting these people you dislike into your head, controlling your thoughts; why would you be proud of that? In the remaining two times out of a hundred, regulating your emotions by providing them the feedback in a calm, direct manner is as effective as doing so in the manner this blog post took; sometimes it is even more effective, because people generally do not engage with others who they perceive to be acting without reason.
You'll discover this path on your own, and make mistakes along the way, as anyone has. The thing you need to hear right now is: Your comment had exactly zero impact on me. It is like you never even posted it.
Don't pose as if you're some unflappable master or some other silliness, or have some sage advice to offer. Just be less shitty. Don't tell people not to have emotions because they're "pointless" in your view.
Keep your shitty opinion to yourself.