I honestly can’t think of anything that fans the flame of narcissism more than being judged. When someone judges you they are signaling that there is something about you they didn’t like. Generally they don’t tell you what it was or they say some bullshit thing that isn’t true. The point is you obsess over what part of you it was they didn’t like and if there is any way you could change it so you didn’t get judged in that manner in the future. This whole process is constant thinking about yourself, you are being rejected for something about you so you can’t stop thinking about you!
Also when you’re judged it means there is generally one less person in your life and the resulting alone time is often spent in your head having narcissistic thoughts.
Older generations like to judge our generation and declare us consummate narcissists and they can go ahead, this judgement is just fanning the flames of our narcissism. If you want us to stop being so self obsessed and dwell on anything but ourselves then you have to accept us and point us to something outside ourselves that we could think about.