Gosh, I could be reading an article on JSTO American Anthropology on the Mohave Soul Concepts and want to switch window screens! It's called, right to privacy! I just don't want someone over my shoulder, asking me, question upon question about 'what'cha doing'? 'What'cha reading?' which can then lead to...."why are you reading that?" "what purpose does that serve?" And then, if they want to get more intruding, are you sure that's what you were really doing?

The question isn't a matter of what you have to hide, it's why is what you are looking at, so curious to them?

Is he 'that' insecure'? That comment oozes insecurity, to me! Means, there's lack of trust. imo.