What to say when my dad belittles me? Please help?

Anonymous
"Everyone except you works two jobs while they're at university. Why don't you do anything? You just sit at home alone all day while your friends have graduated and other people are out making a living. Why couldn't you manage to graduate in four years like everyone else?"

Can't fucking take this much longer. For the record, after taking a double major for four years and ending up with extra credits that prevented me from graduating on time, I'm enrolled in six online classes which are incredibly time-consuming because I'm teaching myself subjects like psychology and anthropology. So what can I say to shut him up for good? He spews this bullshit at me every chance he gets and could care less than I got A's in my first two classes, just got an article published online, and was recently accepted to be a Big Sister (mentor).
What to say when my dad belittles me? Please help?
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