In a question, what is the line between "giving insight into the problem" and "dismissing the asker"?

This question may get modded. And I’m fully ready for that…

Imagine a scenario like this: a person asks a question online: “I have <some problem>. What should I do to overcome it?” They receive answers like: “You should <A, B, C>”. They then post: “But it’s impossible to <A, B, C> because <E, F, G>”. The answerers post: ”<E, F, G> isn’t a problem since <M, N, O>” or “if you can’t <A, B, C> then <S, R, T>” The asker then posts: ”<S, R, T> isn’t possible because < X, Y, Z>”. It goes on until one answerer gets annoyed and post: “So what do you want? A magical wish that will solve your problem in 1 millisecond?” The asker posts: “I don’t like your attitude. I want someone to give me an insight into the problem, not dismiss me like this! You don’t know me, you don’t know the place I live so please don’t act like a know-it-all! and tell me what to do!”

What do you think about this scenario? Is the answerer really dismissing the asker? What is the line between “giving insight into the problem” and “dismissing the asker”?