It's an acquired taste. I felt the same way, but when I started trying to get fitter a lot of protein supplements (protein drinks, protein bars, etc) contained artificial sweeteners. After eating these for a bit I got used to the flavour profile and even started to like some aspects of it.

The best comparison is beer. The first time I had it, I thought it was kind of gross. After trying it a few more times you get used to the bitter and fermented notes and the taste becomes more pleasant.