Had that conversation at a bar with a smart wise friend. Basically went like this :

• Bob : privacy is important
• Alice : sure, but I have nothing to hide
• Bob : OK, so what's your salary
• Alice : I don't mind telling you
• Bob : cool, do you mind if I tell that random stranger?
• Alice : hmmm OK, no problem
• Bob : now do you mind if I sell that information to a stranger?
• Alice : well...
• Bob : and how about I sell it to them but I do not share any of that with you?
• Alice : no, that's not fair.

TL;DR: privacy, or lack of, isn't really what triggers people, what does is the abuse of it.