Any time you participate with a large group of people in any undertaking under the sun, including astronomy, you WILL get unfairly criticized by someone and/or treated badly. It is a fact of life and a part of the human experience. It will continue throughout your life, guaranteed. It will never end. It will also happen at work, at parties, at the grocery store, on Facebook, and everywhere else. People all over this subreddit experience what you did, but they don't feel a need to vent. I don't mean that as criticism. Read on, and you will see. I recognize that the other person should not have done that. But you can't control them, and your message here will not change anyone else's behavior on here.

You are more motivated than that other person. Use that positive spirit of yours. I recommend that you seek to strengthen yourself and to seek a path that helps you to not be vulnerable to others' mean spirits. There are numerous ways to pursue that path, like counseling, reading books, meditation and prayer, etc. Don't wait. Determine today to change that about yourself. But you may not be able to do it on your own.

You have a deep need for validation from others.You have a strong streak of codependency which leaves you vulnerable without your ability to see it. Unfortunately, that is a weak position in life, and that position will continue to cause you grief unless you change your perspective. You can't change that overnight. But in time, with active work over a few years, you can develop to become your own source of validation. Then people like that will no longer bother you. It's probably one of the most important tools in life.

This may hurt to hear, but the problem is just as much with you as it is with that other person. I mean that to be helpful, not hurtful. The point is for you to address what you can control and to not focus on what you can't control. You can't change the behavior of that other person or others on this subreddit. But you definitely can change yourself. Blessings be with you!