I think most people are self interested. That's not an innate matter - we could be raised to be better, we can learn to unlearn the worst things capitalist society imparts to us - but most people are self interested, and Natalie comes from a cohort economically that is insulated from the consequences of the status quo, and even benefits thereof - they were never going to be a proper comrade, and any vision of Natalie as this, was predicated on a misreading of the things she said, and also built from incorrect assumptions about elements of her identity (this idea that trans women are de facto comrades does a lot of harm to trans folk tbqh).

Even in properly left circles, there can be extreme hesitance to surrender to a collective identity and a collective interest, due to any number of things ranging from trauma to just pathological chips on shoulders, to the flatly self-interested seeking to exploit people, but even outside that context, it's just weird anybody ever thought the bougie, well-off white lady was gonna have the life experience needed to be what some leftists saw in her.