"When I say 'go high,' I'm not trying to win the argument. I'm trying to understand you and how I can help you understand me." Michelle Obama in a New York Times interview (20 November 2018) about her book Becoming.

Politicians and pundits have countered going high by name calling. This is not a strict ad hominem attack. Instead this is a lexicographical and pronunciation gimmick. A classic example is when the democratic party becomes the democ-RAT party. Comedians like Bill Maher turn Tea Party voters into Tea Baggers. Opinion givers lie Tucker Carlson turns Don Lemon into Don, le-mon. The difference between this and "Cheeto Mussolini" or "Barack HUSSEIN Obama" is subtlety and plausible deniability. Making fun of a public figure's name doesn't lead to libel or slander lawsuits. It is also a linguistic code that implicitly defines groups of people.

Not all politicians or pundits call names. Many do. Very few call it out when they see it. They should.
The media moguls collection wonders why they don't.

Put a different way, this collection explores argumentum ad hominem via argumentum ad nomina to better understand name calling.