system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some people like the taste of something but someone else detests it? For example, Coffee. I hate the taste of it but my girlfriend loves it.
gpt
A few major elements play into things we like the taste of.

* There have been studies that what a woman eats while pregnant can affect the flavors that the baby prefers once they start eating solid food.

* From the time we start eating solid food until we're able to reliably walk on our own, we're built to largely trust whatever our parents feed us as being good and whatever that tastes like gets coded in our brains as "good". This is also the phase of life when we'll put pretty much anything within reach into our mouths.

* As a toddler, a general resistance to trying new foods kicks in. Some think this is to keep kids who can now wander off, but don't yet have any good judgment, from eating things that aren't safe.

* There's a general, built-in bias in our taste that treats sweet as inherently good, bitter as unsafe until proven otherwise,  sour as a toss-up, but safer than bitter.

* After that point, anything that doesn't make us sick and has caloric value CAN taste good. If you eat something and your body detects good calories afterward, it will associate that flavor as good. This is what we mean when we use the phrase "acquired taste". You can literally make yourself like something by loading it up with calories and choking it down often enough.

So, for something like coffee, if your mom drank a lot when you were in the womb, you might be pre-disposed to like it a bit. Then, if you put enough cream and sugar in it (load it with calories), you might fairly quickly train your taste to disregard the bitter and view it as tasty. This is also the idea behind covering veggies in cheese sauce. Though, the greater our initial dislike of something, the more of this kind of training would be required to start liking it.

In fact, this whole system can be up-ended as well. When calories are supplied to the body without any flavor present (tube feeding for example), the body's appetite shuts down and drops to a really low level.

Because we all have a complicated combination of all of those things, we all tend to like a different blend of things.