Certain people, particularly narcissists, feed off of your emotional reactions to things. The best way to not 'feed' them is to avoid them entirely, but that's not always possible. So, what do you do when you happen to be around one of these vampires? Be as boring as possible. Be a gray rock. I hate dishonesty, but in some cases, with certain people, it may actually be safer not to be honest. If expressing your true opinions and feelings around a person makes you feel unsafe in any way, avoid that person like the plague. If that's not possible (yet), then ...