I used to, but they're pretty easy to crack if they're easy enough to be kept in your head (well, my head lol).
And ya never know when laws might change, or some bitter ex decides to steal shit, or whatever. Critical in terms of dangerous in general, obviously not, but sensitive, yes.
Considering the way the US has been lately, nobody should be keeping any kind of personal information available where state or federal governments can access it. People have been fucking arrested for having a miscarriage. They've been arrested for having an abortion based on Facebook information.
All it takes is the wrong law being passed, and we can all be fucked.
Also, there's absolutely no reason for you to be an asshole about it. If you can't partake in a conversation without that kind of behavior, it may be that you really would benefit from some therapy.