Not "knowing" if things bother one is just lack of self-awareness. It takes time and practice to look inside and identify/name what one is feeling. But there's no time limit in going to your father, Orvel, and telling him how his laughing made you feel (left out or like a child, unimportant, etc.) and discussing it with him. As you have seen, it is hard to know what we, ourselves, are feeling and identify it so when we are dealing with other people we have to be completely clueless unless they help us by telling us what they are feeling and why! Otherwise our own imagination gets in there and supplies a reason that makes sense to us but we all too easily misread what they seem to be emoting and/or have no clue of their reasons. I can appear angry to you because I was just in an argument with another person. But you will easily think I am angry with you.

Orvel, depersonalization is when you don't feel like "yourself", you are watching this other person say and do stuff and it's you that's doing stuff but feels like you are just observing. Yes, you don't feel anything, but that's not the same as not knowing what you are feeling. As with all words and objects we have to learn what the words mean and have the "a ha" moment when the word matches and you can say, "Oh, this must be 'happy'!" or, "I feel 'disappointed'." Thinking about a feeling word and looking for it over a few days can help. My therapist had me do that with "disappointment" and "humiliation". Of course, as soon as I started thinking about each words (one a week :-) I immediately felt "disappointed" and "humiliated", LOL