What is incorrect about the phrase: "She don’t like chocolate cake"?

The phrase "She don’t like chocolate cake" contains a grammatical error related to subject-verb agreement. In standard English, the subject "she" is singular, which means it requires the singular form of the verb to match it. The contraction "don't" is a colloquial form of "do not," which is generally used with plural subjects or with "I" and "you."

Instead, the correct form should use "doesn't," which is the contraction for "does not" and is appropriate for singular third-person subjects like "she." Therefore, the phrase should be corrected to "She doesn't like chocolate cake" to maintain proper grammatical structure. This aligns with the rules of subject-verb agreement in English grammar.