Until 1975, I had to have cream and sugar, couldn't do without it.
Then I helped put together a group in Nashville and we already had 2 months of steady bookings 6 nights a week.
We had 18 days to make a band out of 5 complete strangers. We rented practice space in an industrial area of Nashville and began 16 hour practice days. At the location, there was only an old busted up electric percolator useful only for heating water. There was instant coffee (yuk) and no cream or sugar. Every morning when I would head for rehearsal, I would forget to pick up some cream and sugar, so I had to drink black instant coffee.
We head out on the road for our first gig in Roanoke, VA. At the first stop, I ordered coffee and put cream and sugar in it. It tasted bad to me. I asked for a new cup and drank it black. I've been drinking it like that since.
But, to me, the cream and sugar are not the offensive ones. The most egregious thing one can do to coffee is flavoring. I can't drink it. If I'd wanted crème brulee, I'd order crème brulee! I order coffee!
Man I agree, flavored coffee is the nastiest. I drank a cup of peppermint something flavor java at a recent Christmas party and I pretended to be happy, but it was really putrid.
I remember percolators. They took a long time to brew up a pot.