I saw an interesting Youtube video about why people like/dislike certain music genres. Music can be decomposed into musical dimensions. The three most relevant of these are
Melody (M)
Harmony (H)
Rhythm (R)
The fourth dimension could be Sonics (S), which is a combination on things like timber, spatiality and dynamics). The fifth dimension could be Lyrics (L), which is often strongly related to melody.
Each music style/genre uses a weighted "spectrum" of these musical dimension so that some of them are "carriers" and others are "supporting". For example Baroque/classical era is (Mr) (carriers melody and rhythm to lesser degree) while romantic era classical is (Hr)(carrier is harmony and rhythm to lesser degree). Interestingly pop music uses all dimensions equally and that's the reason why each dimension has to been simple in it's musical message. So, if your ears are tuned to say romantic classical music which emphasizes harmony they expect complex harmony and the I-IV-V-vi or whatever chord progressions of pop music sounds very simple. Pop becomes more interesting when you listen to all the musical dimensions simultaneously: Melody, harmony, rhythm, sonics and lyrics. Similarly, people liking pop may hate jazz because jazz uses complex harmony (and rhythm), but is very little about sonics for example. Modal jazz is more about melody and less about harmony etc. Rap is Rhythm, Sonics and Lyrics and feels very "empty" if you expect Melody and Harmony.
Learning to "like" a new music genre is about learning to tune your ears for the particular dimension spectrum and one can learn to be able to switch between spectrums fast. Listening to one music genre only is not a healthy "diet" because it makes it difficult to appreciate other music styles with different dimension spectrums.
This theory agrees well with my own experiences in learning to like music I didn't care about before. Expanding music taste makes it easier to learn to like other music, because a certain genre I already like may have a similar dimension spectrum. Pop music has been a mystery for me, because it uses very simple musical structures, but at it's best is in my opinion stunning music. This theory explains that mystery nicely. It also explains why someone heavily into romantic classical music (Wagner, Brahms, Liszt etc) may not be that much into J.S. Bach and Handel.
Be openminded. Try to figure out what is good and tune your ears to that. Avoid too limited music diet. It just makes you hate everything else.