I've traveled (and in some cases lived) in different countries around the world. Though all had a number of delicious food options, there have been some that I definitely disliked. A few include:

Taiwan:

• Chou doufu (this is translated to "Stinky tofu"). The tofu is fermented and takes on a slightly brown color. The smell, as the name states, is pretty ripe. It's certainly an acquired taste.
• Dorian fruit. This large fruit has a rather unappealing smell, and like many other ripe smelling foods, sort of tastes as it smells. Again, an acquired taste.
• A particular Taiwanese pastry that includes salty dried pork on it. I am not overly fond of several Taiwanese/Chinese pastries, even though many look quite delicious. But one that has the salty dried (hairy-looking) pork on it is particularly unappetizing to me. The first time I tried it, I even found a bone in it.
• Salty mini fish. I'm not sure what type of fish they are, but they are very small and prepared with tons of salt. I would definitely not try them again.
• Oyster omelet. In the city of Tainan, oysters are popular. I'm not overly fond of oysters, but very much disliked them in a particular omelet I tried. I think some of the other ingredients in it were also unappetizing to me. But again, many there love it.

China:

• Some of the same foods above that are in Taiwan are available in parts of China P.R.C.
• Thousand year eggs. I wouldn't exactly gag from it, but it's not my favorite by a long shot. I do like their "tea eggs", but the thousand year eggs are different. They are kind of marinated (in a sense) in a clay for a long time. They look interesting, but aren't worth it, in my view.
• I sure wouldn't eat bat meat.

Czech Republic/Central Europe:

• I dislike what they call "blood sausage". Hint, it includes lots of blood from the animal, which is surely pork.
• Super ripe cheeses (i.e. Czech beer cheese, another cheese I forget the name of, German Limburger, and the like.)
• Toast with fried lard on it. The taste is actually not bad, especially the "brown bits", but the thought of eating lard does get to me, even though in some ways it's not so much worse than butter.
• Headcheese. It's actually not THAT bad, but isn't that great either. Usually served with lots of onion, white vinegar, and sweet paprika. I leave that to my Czech husband. Note: It's not cheese. It's pig parts (including meat from the head, etc.) chopped and molded with natural gelatin into a sliceable deli type meat food product.
• Carp. Lousy-tasting fish. Even worse is that my husband likes it fried with anchovy paste on it.

USA:

• Ham salad. I always hated it.
• Dried/chipped beef or hamburger gravy on toast (aka S.O.S. or "***** on a Shingle"). Never liked them.

Innards (liver, kidneys, heart) and snapping turtle or tripe soup. Definitely not my cup of tea. Nor am I fond of brain (sweet breads) or the fish called shad, which is a big deal in my childhood hometown. Not only is shad unappetizing, but sometimes people even eat shad roe, which is even yuckier. What they do is to fry the roe, often with bacon or some other add-in. Truly only an acquired taste!

Peru:

• Guinea pig. The actual meat is not THAT bad tasting. However, it is usually prepared whole (with fur removed). Seeing the whole creature on your plate is unappetizing. Since the meat is less than delicious, it's not anything I would try again.

Obviously, I do give foods a fair shake.