I can also provide some input on how to insult different kinds of astronomers depending on the field they work in.

Cosmology: Use the word "cosmology" interchangeably with "astronomy."

Simulations: "Did you include dust?" If they say yes then ask about magnetic fields. Either way, claim that they tuned their physical hyperparameters to achieve their results.

Observations: "Did you follow up with <X telescope at different wavelength>?" Pick one that's especially competitive to request observations, such as Hubble or SOFIA or ALMA, so that if the answer is no they'll feel extra bad about their rejected Hubble/SOFIA/ALMA observing proposal.