Critics and audiences don't always agree on films, performances, and other forms of entertainment because they come to their reviews with different experiences, expectations, and beliefs. Audience members are typically general viewers who are emotionally invested in the film/performance and review it based on their own personal connection to it. Critics, however, may approach the same film or performance more analytically, looking at elements like directing, writing, and acting.
Audiences are often just looking to be entertained, and great storytelling, amazing acting, and lovely visuals are enough to make the film enjoyable to them. Critics might be more critical, looking for missing or weak elements that make a film flawed for them. They often rate films according to an established set of criteria and are looking for something that goes beyond simple entertainment to draw them in.
It's also important to remember that our opinions and preferences can be influenced by the opinions of others. For example, if a critic comes out with a bad review, it might make audiences less likely to enjoy the film. This means that while some disagreements are rooted in personal viewing experiences and criteria, others can be attributed to pervasive media trends.
Ultimately, the discrepancies between critics and audiences come down to personal taste. No two people have the exact same opinion about any given film or performance, so it's natural for them to disagree.