I get the feeling that you might not understand why you're being downvoted. There's nothing wrong with expressing your opinion. But on Hacker News especially, it is important to contribute to and elevate the discussion. After you post your comment, people should learn something from it. If people do, they appreciate your thoughts, and upvote you, especially if your thoughts are very insightful. If you don't contribute anything new to the discussion, people don't appreciate your comments and prefer to downvote you.
In both of your comments, you say that someone is wrong, but don't offer any detailed examples of why someone is wrong. You state, "This is not an essay, I have no time to write too much." But this is Hacker News. If you read through many of the discussions here, many of the comments that get upvoted the most are actually essays that go into a lot of detail, logic, and evidence to explain each writer's thoughts. And those essays are appreciated because they elevate the discussion so that everyone learns something new.
In both of your comments, you say that someone is wrong, but don't offer any detailed examples of why someone is wrong. You state, "This is not an essay, I have no time to write too much." But this is Hacker News. If you read through many of the discussions here, many of the comments that get upvoted the most are actually essays that go into a lot of detail, logic, and evidence to explain each writer's thoughts. And those essays are appreciated because they elevate the discussion so that everyone learns something new.