You might be used to really sugary drinks, i was an obese child and once my nutritionist took away regular coke and juices from me i couldn't drink a sugary drink without feeling disgusted at how sweet it was and artificial sweeteners tasted a lot better.

There are actually genetic reasons that some percentage of the population tastes both common artificial sweeteners as bitter

https://academic.oup.com/chemse/article/38/5/379/360864?logi...

It's related to why some people taste Cilantro as soap too.