system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does food taste "Bad" and why do some humans like food that others don't?

I personally don't like mushrooms and seafood, and I was personally wondering about why some food tastes bad for some people. Is it a precaution for potentially poisonous food or was it developed by our food surplus and variety? Also, why do some people like food that others don't? Is it because of culture and is it genetic not to like foods your ancestors did?

EDIT: In the title I meant to say why does SOME food taste bad. Sorry for being careless.
gpt
Culture plays a massive role in taste and appreciation of food. If you grew up eating salted fish, you are far more likely to enjoy it in adulthood. For a more western equivalent cheese is not terribly appreciated in Asian countries, and is definitely considered an acquired taste for older generations.  

There are some genetic and evolutionary factors as well, kids go through a phase of disliking bitter foods 1. because toddlers put everything in their mouths 2. most bitter things are poisonous. 

There is a theory that if you dislike the texture of some foods that you may have a minor allergy. Coriander (cilantro)  is often used as proof - parts of the population taste a nice herb, others taste soap and it has a soapy texture in the mouth. Those who taste soap have a minor allergy to the plant.