This is the stupidest thing. Dad needed new headphones so I bought him a pair. Last night he found out he can't use them with his laptop
and do his work, because there aren't enough usb ports. I said 'OK, do you want to swap with a pair of my headphones (with jacks) or if not, put them in the box and I'll return them tomorrow'. He said I was being difficult, and when I asked him how, he just took that as further evidence. So I:
-bought him headphones as a nice gesture
-offered an immediate solution, swapping with me
-offered an alternative, I will return and get you new ones
What a monster I am, how could I have done that to him /sarcasm.
THIS MORNING I wake up to him shouting the house down about how I treated him like s**t, how everyone's always judging him, and how we (but specifically me) can all go f**k ourselves, because we're 'vile and nasty'; this whole diatribe was inspired by the headphones debacle. I thought it was a mild disagreement; he evidently spent all night stewing over it because he's f*****g insane. And it makes me so angry because he's acting all persecuted and judged, when really
he's the one that judges everyone else, and
he's the one that's deliberately nasty. I was super confused so I just went in to get the headphones off him, and he was
so horrible. I don't understand

. I know he's not neurotypical (even if he doesn't acknowledge it), so he is hard to fathom anyway, but what the hell this is I don't know. Recently he says stuff like "I'm sick of you going on at me" and "I'm sick of you always treating me like s**t", when neither statement is remotely true (if anything, the roles are inverted). So, insecurity on his part maybe? False sense of persecution? Whatever it is, it really hurts.
I was so angry and confused that I just screamed, and I had to go and cause myself some mild physical pain to calm down enough to function. AAAAAAAARGH!! ! !

No it isnt your fault at all! Dont think it is in anyway, it sounds like he was looking for an excuse to vent and your kind hearted gesture was just that hence why it makes no sense because you could have given him the sun and he would have still given you the same reaction! I cant really give any personal advice as i can only go by what you have thus far said only to give a wide berth on the fella for a good while! Try not to be confused at yourself as it seems he has issues he needs to address himself. Gaslighting isn't the best way to communicate from your fathers point of view!