abrogate, arcane, mordant, mundane
Donald Trump has abrogated his responsibility as a parent to change his son's diaper. He claims that he does not know how to perform this apparently arcane task. (Notice the mordant tone of that sentence. What could be more mundane than changing a diaper?)
abrogate - (verb) to abolish or do away with
arcane - (adjective) requiring secret or mysterious knowledge
mordant - (adjective) sarcastic
mundane - (adjective) ordinary