Final answer:
Poor practices that damage customer relationships include lack of preparation, arriving late, messy appearance, negative attitude, and lack of enthusiasm, which must be avoided for business success.
Step-by-step explanation:
Fostering solid customer relationships is crucial for business success. A few poor practices that can damage these relationships include lack of preparation, arriving late to meetings or deliveries, and messy appearance that conveys unprofessionalism.
Additionally, exhibiting a negative attitude or a lack of enthusiasm towards customers' concerns can drive them away. A business manager should avoid these practices to maintain good relationships with clients and to avoid the risk of being perceived negatively or even losing their job due to dissatisfied customers.