They are all “celebrating” ‘Festivus’. A bitter, hate-filled pseudo-holiday for atheists, created for the Seinfeld sitcom.
In practice, it has four parts: bitter, Keith Olbermann-type hatred of anyone better than you; lashing out cruelly at anyone nearby; cheap alcohol abuse to aggravate depression; and sneering, resentful sarcasm against anyone with religious faith.
Correct in every regard, which is why it was funny. I’m not certain that the people who take it seriously realize they’re being laughed at.