Answer:
The most believable reason why someone might not accept a compliment is the following one:
Compliments are sometimes mistaken as cynical remarks.
Step-by-step explanation:
It happens occasionally due to the subjectivity of the person who is given the compliment, which might be viewed as a way to express sarcasm or irony. I remember an occasion at school when I told a girl she was beautiful, to which she replied angrily: "You're not that beautiful yourself!". I was astonished, since all I'd wanted to do was paying her a sincere compliment, but she thought I'd meant to say the opposite, that is, that she was ugly... Therefore, the most believable reason why someone might not accept a compliment is that compliments are sometimes mistaken as cynical remarks, that is, they are rejected due to misinterpretation.