Well, like [Unknown site tag] said you can turn comments off, or you can do what I do and use friends-only posts for stuff you wouldn't want the whole universe reading, or you can just use the diplomat's option and reply by email to awkward questions people ask in public comments. Or ignore them altogether, of course. The Internet is hugely flexible, use it as a set of media over any of which a conversation can be continued. You don't have to have all of a conversation about an lj entry in public lj comments, just as you don't have to hold all of a conversation you have face-to-face at the same volume or within earshot of your other friends. Or even at the same time or in the same place, come to that.

You seem to ahve this problem with asserting your right to only tell people as much of the facts as *you* want to tell them, instead of believing that once they've got one bit of information they then have a right to know the rest as well :) Just because people are naturally nosey doesn't mean you're obliged to satisfy that.