“Groups don’t hallucinate together” is a slogan, not science. There are documented collective apparitions, such as the Marian appearances at Fatima or Zeitoun, seen by crowds.

That is a fair challenge to the slogan version of the argument, so here is the careful version. Expectant crowds in a charged religious setting may report seeing something. The resurrection appearances happened to people who were expecting nothing, in ordinary settings, over an extended period, and included conversations, meals, and physical contact. Crowd apparitions also do not explain Paul, who was hostile, or James, who was skeptical, and no apparition empties a tomb. The question is not whether groups can share an experience but whether that model fits this particular data, and it fits poorly.