You are partly right about this site, and partly not quite right.
I thought this was an informal forum (like many others similar) where one could ask a simple question and receive a few answers.
That's mostly true. This is a Q&A site, where you can ask questions and you can get answers. But it's not like most other similar sites in that the experienced users on this site are expected to help maintain the quality of the content, not only by posting good answers, but also by editing questions to make them better.
That means that many people who don't know your answer will still read your question, and want to contribute. We want our questions to be high quality -- proper spelling, proper English, proper punctuation, etc. On the other hand, we certainly don't think people should be penalized for not being professional writers. If users see things that they think they can do to make the question better, they will do that. You really should welcome this kind of attention to your question: by improving it, those users are making your question "more attractive" to readers, making them more likely to read it and answer it.
Experienced users also know about the conventions of this site -- in particular, we're much less informal than other sites, so we tend to prefer you don't include things that aren't part of the question ("hi", "I'm confused", "please help", etc.) Everyone who posts a question is confused and wants help, which is why this site is here. We prefer to focus on the "heart" of your question, and those users were just helping you trim some of the fluff.
Also, it's generally not a good idea to try to have a conversation in your post, especially if you're wanting to complain. If you want to request clarification, or respond to, an edit, you can leave a comment on your question. If you want to complain about something you think is being done wrong, that's what this meta site is about.
Note that your question got answered, and in only a few hours. (Game of Thrones is pretty popular, so that's probably not surprising.) Don't let the community editing freak you out. That's just how Stack Exchange works.