The context is when this person joins an existing team/project to help out and do some work. So there will be, for example, a meeting where 4 people are up to s

The context is when this person joins an existing team/project to help out and do some work. So there will be, for example, a meeting where 4 people are up to speed, with this person present. It's not expected that they know everything up front, of course. Onboarding to a new project takes learning. A big part of the irritation to me is the fact that they decline to phrase their question as a question. Always a statement. They won't ask "what is X?", it's "I don't know what X is." Leaving the onus on others to reinterpret as a question for them.