They don't understand that we need information to help them. They will get offended when you ask them to elaborate. They won't understand the answer no matter how much you simplify it. They just want their problem solved with the least possible amount of effort on their part.
Here’s an example: my account on StackOveflow has enough reputation to answer questions on SO, but on other StackExchange sites that are very related I can’t do that just because I spent more time on StackOverflow.
The whole setup is basically repelling you from engaging by design. The site should already know from my SO reputation that I’m trustworthy enough to answer stuff on the other similar tech related stackexchange sites.
It was built for a time when you actually needed to filter out low quality questions and answers, but now that the users have abandoned the ecosystem the bouncer at the door makes a whole lot less sense.