1. Too high acidity leads to bad taste.

2. Lactose intolerance. Yogurt contains lactose, which may also affect some people's taste acceptance.

Artificial additives, such as sweeteners and preservatives, may affect the taste of yogurt.

4. Problems in storage and transportation, such as too long time or improper temperature, may lead to further propagation of bacteria in yogurt, release more lactic acid and other acidic substances, and make the taste more sour.

5. Problems in processing, such as using inappropriate ingredients or techniques, may affect the taste of yogurt.

These are some reasons that may lead to the unpalatable yogurt. But everyone's tastes and feelings are different, so some people may like the rich taste and sour taste of yogurt, while for those who are not used to sour taste, yogurt may make them feel uncomfortable.