I don't like the taste of olives but would really like to be the sort of person that eats olives. I tried to force myself to develop a taste for them last year when in Italy, and ate one every day, but it didn't really stick. Same can be said of Guinness. I've always loved the look of the drink and it's culture and status and Irishyness, but never got into the taste of it. It was the first drink I ever ordered, in a bar in Dingle many years ago but I only managed to down 3 mouthfulls. I've tried again, on and off over the years but never got anywhere with it. So I'm a Guinness and olives failure.
On the other side there are lots of foods that I like that I know others would like to like. The only one that comes to mind right now is tomatoes.