Ivanka used her motherhood as a self-glorifying distraction from the fact she is an enabler of her father's agenda. Sam Bee was having none of this. Good for her. Bad for her was Bee's use of the c-word. It assured her the spotlight but undid her message for many people. A large group of them, I'd hazard a guess, had never heard of her. It gave Trump ammunition.
The c-word ranks among all the other obscenities and euphemisms for human genitalia as far and away the most insulting and demeaning.
The c-word is the most egregious anti-woman insult. The connotation is the person one is attacking has the some of the worst, often stereotypical, characteristics of certain women. It suggests that all there is to being a woman is her having a vagina. When someone calls a man a prick it means he is a jerk and nobody is saying all there is to him is his having a penis.
The description "feckless cunt" does not describe Ivanka. While you could make a case for the later, that word is a poor choice. phase is catchy, however feckless means ineffective, incompetent, futile, lazy, indifferent, or having no sense of responsibility. The last two definitions could be applied to Ivanka if you want to stretch the way feckless is generally used. (Below, From Dictionary.com)
Historical Examples
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If ye miss that, ye must be as feckless at the sailoring as I have found ye at the fighting.
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My love is so feckless, that it is a shame to offer it to Him!
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Madam, let others take their silly, feckless heaven in this life.
Sam Bee could have found far more accurate words to describe Ivanka Trump. What do you call a powerful greedy self-centered woman whose behavior is antisocial, often criminal, and who lacks a sense of moral responsibility or social conscience?
The bolded italicized words above come from the dictionary, not the clinical, definition of sociopath (currently called anti-social personality).
Perhaps if Sam Bee wanted a catchy but more accurate phrase to describe Ivanka she could have called her a synthetic sycophantic sociopath.
Addendum:
Not much research that has been done about female sociopaths. They are often charming, manipulative, cunning, and deceitful. They can be exploitative and lack true empathy. Along with male sociopaths, the personality disorder appears to be a result of a biological predisposition and with certain environmental influences – most often, sexual or physical abuse or neglect.