It doesn't surprise me that men who get solitary for violent infractions hate it. These are hyper-social people, who need continuous interaction with others, whether as a friend or a competitor or a predator. By contrast, I can go weeks without speaking to a person. It just doesn't sound that bad, relatively.
Obviously, I'm speculating. But a real test, taking ordinary people and subjecting them either to solitary or a confined population of thugs, and comparing the results, would be pretty unethical. At the same time, you can neither trust the personal account of a woman in extraordinary circumstances, nor those of the most violent, probably psychopathic, criminals.