Maybe in that fanfiction, Naruto's over - eagerness to be recognized could be misconstrued. His loud and boisterous nature might annoy people. For example, if he constantly interrupted others or pushed his ideas too hard without considering others' feelings, it could lead to dislike.
One reason could be that some fans might be disappointed with certain aspects of the original Naruto series. For example, the development of some characters might not meet their expectations. So, they create fanfiction to express their negative feelings.
One reason could be bad writing skills. If the author doesn't know how to structure a story well, or has grammar and spelling mistakes all over, it can make the fanfic hated. For example, run - on sentences and incorrect verb tenses can make it a pain to read.
Comic Sans gets a bad rap because it doesn't fit the aesthetic standards for a lot of designs. It's often used wrongly and looks out of place, making it a font that many people have grown to dislike.
Some people might create 'Boruto' abused fanfictions out of a desire to explore dark or edgy themes that are not present in the original series. But this is a wrong approach as it goes against the positive nature of 'Boruto'.
One reason could be that it takes more time to create detailed and high-quality art for each chapter. The story might also be more complex, requiring more planning and refinement.