There are certain types of food which I cannot abide, however often I have tried to eat them. And there are other things which I have never tried and doubt I ever will.
For me
a) Food I have tried and just don't like
Aubergines
Courgettes
Polenta
Sashimi
Tapioca/semolina
Pearl barley
Herb dumplings
Fatty meat
Green peppers
Squid
Runner beans
b) Food I refuse to try
Raw oysters
Snails
Octopus
I'm sure there's more!