There are plenty of foods that others have listed that I can honestly say I have never tried, simply because they look so disgusting...
Mainly shellfish like oysters, cockles, mussels etc - they look like something picked out of a tramps nostril. Beetroot 'cos it smells gross, anchovies as they look disgusting, tripe for the same reason, sardines/pilchards/King Prawns or anything where i can see it looking at me or imagine biting through it's intestines as I eat it...
I just don't like - coconut as the bits get stuck everywhere (it's not the taste, I like Malibu!), I agree with WhiteBear about nuts in chocolate (just WRONG!!) and sushi - why would anyone eat raw fish (that includes smoked salmon - yuk!)?
And WHY does anyone eat sprouts? They only come out at Christmas and I am sure that people force them down just because they are 'traditional'. I am pretty sure that nobody in my family would touch them at any other time of year!!