I realize a lot of people don't like to be alone with their thoughts. I'm fine. Usually there's a song playing if I'm not distracted, or I'm looking to the future to make plans.
Others, I tend to find, are far more in tune with their subconscious which appears to be saying nasty things to them the moment they're alone.
I had a bad childhood (like many), but I think my coping mechanism was to escape to fantasy (later books, games, art), and as a result I think I trained myself to not spend too long listening to my feelings. It probably is disassociation, but I don't see it as a bad baseline to have.
I feel as though apathy wouldn't come crashing in with an angry face on. I would more expect apathy to just sort of fall in to where the other emotions are going on.
Signed, a person who often has apathy falling into where the other emotions are going on.
Kind of reminds me of my favorite episode of Ren and Stimpy when Ren split himself in the two opposite sides of his personality: his evil side and his indifferent side.