It is not really the people but rather the tools we have and the expectations of new users. The Stack Exchange system is unabashedly a question and answer site and not a discussion forum. The system works great when a user asks a question that fits the format well. When a question is a poor fit, it gets put on hold. The hope is that while it is on hold the person who asked and other community members will work together to make the question a better fit. The problem is that we don't have particularly effective tools to help a new user understand what makes a good question different from a bad question.
From the new users perspective, you have a question and the experienced users are shutting you down. That is obviously going to feel hostile. From the experienced users perspective, if the question is not a good fit, it needs to be shut down to keep the signal-to-noise ratio high. Sometimes they just shut it down, but often, they will try and point you in the correct direction. That direction is often read the help and a bunch of questions to try and learn what makes a good question. As hard as it might be to see, we are not trying to be hostile. We have a good idea about what works and what does not work.
In regards to your questions, I see three problems. The first is that the answers need to apply to lots of people and not just you, second we like questions to have "right answers", and third the right answer for your questions depends entirely on you.
For example, what classes should you take to prepare for a PhD in Political Science depends on obviously what classes a particular department requires, but more importantly on what classes you have taken, what you enjoy and what your specific goals are. In order to give you a good answer, we really need to know you. That of course means the answer is not useful to anyone else. If instead we give you a generic answer, then we are not really accomplishing our goal of providing high quality answers. The odds are the answer would just be excepts about admission requirements and required courses pulled from a few Political Science departments websites. Again, this does not help you or anyone. So instead of wasting our time and your time, we put the question on hold.
We are a site about academia in general but not the specifics of individual fields. There are specialist sites on the SE network where you can sometimes get helpful information (e.g., Biology and Physics), but there isn't one for Political Science. This means that the SE system doesn't really have a place for questions about Political Science. If you can frame your questions to be more field agnostic, while still asking what you want, it might help.