I think it makes some sense. They have a superiority complex because they jumped on the bandwagon early, in other words - they feel like they found a diamond in the rough that was special to them because it had been largely undiscovered, and now people are ruining it for them. It's kind of the same logic as people looking down on bandwagon jumpers for sports teams once they make the playoffs. Like these hipsters/fans have been supporting the team (or whatever it is) since the beginning, and they feel like they have more loyalty and feel more superior as a result. If that makes sense.
And bragging about early dinner sounds good, you get the food while it's still warm. But I see what you're saying, I'm just screwing around.
Again, I don't really buy that perspective because then there wouldn't be much to differentiate a hipster from man-children who yell "first!" in comments sections (they're pretty clearly wildly different complexes, IMO). I think it's more of a "feeling special/superior because you think you've unlocked something that nobody else has the intelligence to" thing (which being early just happens to be a byproduct of) rather than a simple "satisfaction from being first on the scene and feeling like you own it" thing (which I think a hipster would view as beneath them).
In fact, I don't think there's a shred of loyalty, ownership, or "I'm the real hardcore fan" element to hipsterism at all. Hipsters traditionally have no allegiance to the thing itself and hop off (or worse, deny ever being on in the first place) the moment a bandwagon hops on, whereas "true fan" gatekeepers stay on like it's their birthright and try to push the bandwagon off. They seem to be coming from entirely different and unrelated places, in my view.
But this is a lot of talk about nothing, I guess.