When you don't grasp/get/understand what others are discussing do you blame them or youself for the lack of connecting?

In my encounters with people, I can usually grasp what people are trying to say because I take the time to listen and they usually take the time to explain what they mean. The only time I may get upset is if the person is deliberately being vague. And when you ask them to clarify what they mean, they don't. I may get irritated when they do that but I don't get belligerent about it nor do I become hostile or angry. For me, it's not worth it.

I think much depends on how articulate a person is.  That determines how well they express their thought in a clear manner.  If I don't understand, I will ask for clarification.