The concept of Illogical Classification-Based Thinking (ICBT): the tendency to group traits based on impressions rather than logical connections, is related to consumer behavior. This study explores how ICBT and Positive Associations influence consumer impressions of products and companies in a Chinese context. We conducted two large-scale experiments involving 660 participants, divided into three groups: control (indefinite attributes), experimental (definite attributes), and experimental with AI-generated visuals. Results showed that ICBT significantly influences consumer impressions even with indefinite attributes, and definite attributes enhance positive impressions. AI-generated visuals generally reinforced positive impressions, though their impact varied. Notably, while cis-female participants exhibited stronger positive impressions with definite attributes and visuals, the gender differences were not as pronounced as hypothesized. These findings provide insights into the cognitive processes driving consumer behavior, emphasizing the role of ICBT in forming positive associations and offering practical recommendations for marketers. Future research should explore these phenomena across diverse cultural settings and examine the long-term effects of ICBT on consumer behavior.