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.
It gets a ton worse than nicknames between public figures. Raging hostility by non-public actors at non-public individuals, impeccable timing to maximize damage..it seems at times, if you’ve seen it in person, only the intelligence of Satan and his minions can orchestrate this kind of brutal misbehavior.