The indifference of Stoicism has a hard time keeping up with the Swerve of Epicurean Philosophy
That's also what I told them, but they replied to me that they do not claim to be indifferent. They said that it is the surrounding that is indifferent, and they only have control of their mind whether to affirm an indifferent object as painful or annoying. They gave me an example that when a pen falls on the ground, I shouldn't get annoyed because it is indifferent and does not have any intention to annoy me. Or I can say that it is destined to annoy me so I better not be. This is why I asked them how we could control our mind and feelings toward something if the external world is highly deterministic and uncontrollable. It would be like fooling myself that I am in control of everything.