There may be two main reasons for the bad relationship between Xiaofeng and chubby girl:

1. Traffic competition caused by similar video types: rural chubby girl turned into online celebrity, attracting nearly 1 million fans by cooking food. However, Xiaofeng's food is more popular with the old people and has been widely praised. This may cause the fat girl to worry that Xiaofeng's traffic will exceed her, and the relationship between them will become tense.

2. Conflict and failure to reconcile in time during filming: According to relevant information, Xiaofeng and Pangmei may have had conflicts during filming before, but they didn't apologize to each other, which made the relationship fail to ease.

The above is only speculation, and the specific reasons and circumstances may only be clear to the parties themselves. Contradictions in interpersonal relationships are complex and diverse, everyone has his own position and viewpoint, and only the parties can truly understand the whole picture of the relationship.