Dear Log,
«He told a joke about Celts: "A Celt is someone who, working in a field on his own, falls out with himself."»That's not a joke about Celts, it's a joke about HYOOMONS.--"Saving Cornish: But Stop. Isn't That Spelled With a K?"
To paraphrase Patton Oswalt: It's like he's a Martian telling racist jokes about humans. Filthy humanist!