My father, in his 60s, is constantly complaining about how miserable he is. He and my mum retired to what I think is a very bleak, antisocial rural town on the coast where there is nothing to do and you need to drive 20 minutes at least to get anywhere. Previously they lived in a nice town on the outskirts of London, and my dad worked in the city. Since moving, they've piled on weight, have no friends, and mainly spend all day watching TV. I knew this move was a mistake, but they never listen to me.
Growing up, my dad bullied me and my brother, but particularly me. Would lose his temper with me over nothing, used to smack me or threaten to knock me out right up to the age of about 16/17. I was severely depressed, self harmed, and had an eating disorder throughout my teens - my parents didn't seem to notice or care. I had no support. If I spent a long time in bed or in my room (depressed and to avoid abuse) they'd acuse me of being on drugs or being up to no good.
Aibu for not having a lot of sympathy for him? I know their happiness is not my responsibility, but I struggle with what to say to him to brush him off when he's telling me how unhappy he is. The temptation to say what I really think is very strong but would cause a huge argument!