Passive and Stoicism may seem similar, except a passive person is more ignorant, less cautious, and very,very open minded to the point where you just toss them a piece of bread, and they are happy. I used to have a friend from asia who was just like that, being a refugee where food at that setting was scarce. However, being stoic is much more difficult to be, and requires a lot of mind and spirit. Its Basically a way of responding to stressful situations less serious, and if someone loves you or admires you, you would seem to draw back from that person, even being less interested in human pleasures such as eating, sex, and all that shit. A stoic person may seem cold, but are usually the ones that trust no one, they take matters less serious, less real, but they still take caution. And when I mean less serious, I mean like "Not Keeping it Real" if someone insulted someone whose stoic, they will not care as words are just motives, not actions that damage their well-being. Furthermore, it has no relation to autism or that kind of modern day bullshit Disorder symptoms, Stoicism is just a behavioroul technique to feel less pain and illusions originating from a greek teacher named Zeno of Citium, or from the person's past experiences. To ignore both pleasure and pain may be a drawback for ignoring joy, however, subjects like love often have betrayal and often many people find it hard to be embraced then forsaken over immature motives, or they just simply despise all sort of illusions and lies. A stoic person can handle being independent most of the time than a passive one. At times, I may seem stoic, but I am more of the masochist type since I like being slapped, spanked, licked, carved, and leashed.