This isn't and shouldn't be the typical response to such things.
The boss had also become vulnerable asking you to be 10% more vulnerable.
I think I would respect it more than harsh cold calculating boss.
And also the chinese gospel's taking its effect here , the post above this paraphrased it differently and this has taken it to completely different level.
Nobody is forcing you with a gun to tell things or else you are fired
the boss just said , " Hey if you are comfortable , lets try to be a little vulnerable " and if you didn't like it you could've said " hey boss , I appreciate your gesture but I really really wouldn't like to share it as it would be a violation of my privacy , hope you understand "
This would probably be my approach if I was one of those people who hated boss asking him such thing but I don't. I think I like it.