Modern fruits are ‘unnatural’ already, they’ve been changed by 10,000+ years of human selection to contain way more sugar and way less fiber. The point is, we evolved to “like” certain things in the context of them being very rare. In today’s abundance, only eating what your brain-of-the-scarce-past evolved for will make you sick.

Also, you might be a super taster (https://en.m.wikipedia.org/wiki/Supertaster) and just find bitter things extra offputting. Maybe what you think coffee or vegetables taste like isn’t what most people experience.