Here's why:
* Disagree: "Dis-" means "not" or "opposite of". "Disagree" implies a lack of harmony or shared understanding.
* Dislike: "Dis-" again indicates a negative or opposite sentiment. "Dislike" means to find someone or something unpleasant.
* Disapprove: "Dis-" signifies disapproval or rejection. "Disapprove" means to have a negative opinion of someone's actions or character.
So, "dis-" is the prefix that indicates a lack of positive connection with someone, suggesting that you "don't get on" with them.