I'm rather surprised at some of the responses here. For many people, especially when they're working on difficult or complex tasks, an interruption will cause

I'm rather surprised at some of the responses here. For many people, especially when they're working on difficult or complex tasks, an interruption will cause them to feel a bit angry or frustrated. This is completely 100% normal. They don't mean to hurt your feelings. They just need some space to focus. Give them a bit of space, and think nothing else of it.