Black coffee made from instant coffee is understandably horrifying and tastes like ammonia smells, but have you considered fresh coffee? I don't mean filter coffee, either, the filter paper absorbs all of the tasty coffee oils, leaving only an ashy aftertaste, I'm talking espresso, moka pot, greek / turkish coffee and french press.
Similarly, if you normally find that you hate dark chocolate, perhaps it is because your chocolate is made with slave labour and also not very good.
I am currently enjoying a fine ten year old aged Java. It is very tasty, and I highly recommend.
Adding on to this - even a cheap burr grinder with freshly roasted coffee can open up your world.
I splurged on a Bratzza Encore years ago after a Christmas bonus, and was shocked at how much of a difference it made for my cheap automatic drip maker.
Later, I upgraded to a Chemex 6 cup pour over (with a cheap, non-electric gooseneck kettle). That system got me through grad school and several years of shit IT work. All told, for just around $250 (if you look for sales) you can start really enjoying the subtle flavors of coffee.
My setup today is a bit more elaborate, but I still regularly dig out the Chemex when I want to try a new roast.