No one wants to be a noob, or even look like a noob (unless you're attending your first rave, then it's acceptable to shout "THIS IS MY FIRST RAVE!"). But to puff out your chest and exclaim that, while this DJ's set is great, you've should've seen them at whatever event from years ago is corny. Not everyone was into the music when you were. And no one really cares about your old rave memories. If we weren't there, there was a reason. If the DJ isn't obviously lacking in his skills, let it go. Write in your journal about it. Blog about it. But don't fuck up the fun.