“...false witness...”
Contumely is different. More monstrous than mere falsity.
See #30 please.
It isn't just the vague accusations of "racism" or "whateverphobia".
Always referring to an "opponent" or "rival", in public speeches and public writing, by a disparaging "nickname" is definitely a form of "contumely". Thank you for putting a name to something I instinctively saw as wrong.