In online shopping reviews, it is unethical and may violate relevant regulations for consumers to deliberately damage the reputation of merchants, but there may be some extreme cases as follows: 1. **Malicious fabrication of false negative reviews**: Describing that there are serious quality problems with the product, poor service, and other situations that do not exist at all, misleading other consumers. 2. **Exaggerating the problem**: Over-exaggerating some minor flaws or normal phenomena into major defects to cause others to have a negative view of the merchant. 3. **Distortion of facts**: Distorting the purchase process or the actual situation of the product, taking it out of context. 4. **Using insulting or offensive language**: Venting emotions and trying to influence others' judgment by insulting and slandering the merchant's staff and other uncivilized language. Most consumers will make objective evaluations based on real experience, and the behavior of deliberately damaging the reputation of merchants is rare and should not be advocated. E-commerce platforms also have corresponding rules to regulate and deal with such bad reviews to maintain a fair and healthy online shopping environment.