bad way to start the day

Had breakfast with some co-workers after work. On the way home, while we were inside of the taxi just chatting, when we were about to hit the curve to my stop, one of my office mates, asked me something really personal; which totally threw me off. This of course, totally ruined my mood. I hate it when this happens. I hate it when people cannot recognize when they are being nosy. If they do, which I suspect this person did, they still continue to tread all over your personal space; just to satisfy their useless ,self serving curiosity. I blubbered something stupid. Situations like this when they occur, reaffirms my beliefs that I'm better off alone.