My mom always took her coffee black, so did my grandma, so I think it imparted onto me. For me I like the bitterness, when I take a sip of my morning coffee and it hits there's nothing like it.
Over the years I've tried to get into sugared coffees and I still keep coming back to black. Although every now and then iced coffee with creamer and sugar is a good treat.
I used to be a barista. Some rushes were so bad there was no time to drink coffee or eat, so if I accidentally pulled a regular shot instead of decaf, I'd just casually down that mid-rush. Also never liked particularly sweet coffee and I'm lactose-intolerant, so I was destined for this.