A person who is apathetic but also has an exaggerated or distorted view of things, yet possesses the ability to discern others' intentions, might be described as "cynical" or "jaded." These terms capture the lack of enthusiasm or emotional engagement often associated with apathy, while also suggesting a critical or skeptical attitude toward others' motives.
If you want a more nuanced term, you might consider "disenchanted observer," which conveys both a sense of detachment and a sharp awareness of social dynamics. Ultimately, the best term will depend on the specific nuances you want to convey.