Which term best describes the thinking that all other computers are useless except for Dell and Gateway?

The term that best captures the thinking that all computers except for those from Dell and Gateway are considered useless is black-and-white thinking. This type of reasoning presents a situation in an oversimplified manner, dividing it into two rigid categories: either one is completely useful or entirely useless. It lacks nuance and fails to acknowledge the complexities and variations that exist within products or brands.

In the context of this question, someone who believes that only Dell and Gateway computers are valuable ignores the potential merits and functionalities of computers from other brands. This binary perspective can lead to flawed decision-making, as it disregards other options that might also meet the user's needs effectively. By adopting black-and-white thinking, individuals miss the opportunity to evaluate alternatives based on their specific attributes and how well they align with their requirements.