It is not true that drinking yogurt and Sprite together can cause diarrhea, but it is possible to get diarrhea because the drink is too cold, for example.
Yogurt is a kind of milk as the main raw material made of drinks, Sprite is a kind of carbonated drinks, both belong to the more common edible beverages, and there is no contraindications for each other, so under normal circumstances, yogurt and Sprite in moderation to drink together will not lead to diarrhea.
It should be noted that if a large number of chilled or iced yogurt and Sprite drink together, may be too cold due to the drink and lead to diarrhea, but the diarrhea that occurs in this case and the composition of the two beverages itself is not directly related, so it can be clear that yogurt and Sprite drink together will lead to diarrhea is not true.