This post is suspicious to me. When the user profile is clicked, the page says "User does not exist." So would we be helping a scammer by correcting this post?

Yes, in the US, we would only say "She has a green thumb." (Not "green thumbs" or "green fingers.)

It looks like you are trying to find correct contexts for using the word “belittle.” You can tell someone not to belittle you (literally “attempt to make appear weak, small, or less,” usually by insulting the person. The view from the mountain cannot insult you. It is not a person and cannot speak to you. You cannot belittle yourself; belittling is done by someone to you or to another person. You CAN protest or object to someone trying to belittle you, but the “belittling” would be a more common word to use than “belittlement,” which—while technically a word—is rarely used and so sounds a bit stiff.

3. Replace “for only protesting” with “just because I object to.”

“Don’t brag all the time.”

2. Also, the second sentence doesn’t follow the first at all. Are you telling the person not to brag? If so, instead of “belittle,” use that word.

2. The first sentence uses “belittle” again, and while technically correct, it sounds awkward. Depending on what you are trying to recommend to the person, I would prefer “Don’t put yourself down,” or “Don’t underestimate yourself,” or “Don’t sell yourself short.” All are meant to be encouraging.

1. I wouldn’t say “felt belittled.” That is how you feel when someone puts you down. Instead, I would say “was awestruck.” Not quite the same meaning, but more natural-sounding, because you describe the view as magnificent.