Tl;dr the PC answer is really long, people are creatures of habbit, get over it.
Yellow is a more common accent color for various things compared to the usage of pink, take the yellow brake calipers for example... Human brains are commonly programmed to like things that are familiar so certain colors or combinations of colors that occur more frequently will be preferred over others... Thus it is possible pink may be perceived by a wider audience to clash with more colors and as a consequence cause an increased inclination to remove it. In the same many people learn from an early age that certain colors are representative of various things. Our flag has colors, traffic signals have colors, the ink color of pens used by teachers to mark your work has meaning... Frequently pink is not associated with things people like about these vehicles... power/strength, performance, domination or toughness, agression. Pink is more likely to be associated with opposite concepts or emotions. Since we like the familiar, our brains take a shortcut and subconsciously influences our feelings regarding certain colors based on our experiences in life, and how appropriate a color may seem in certain applications. This may cause people to exhibit a different behavior regarding the splitter guards when nothing else changed but the color. Obviously colors are just wavelengths of light oscillating at different frequencies and are otherwise meaningless to the vastness of the universe, however many animals react to colors based on instincts or past experiences and people are no different. For humans these behaviors and emotions stem from basic survival instincts and social instincts ingraned within us and help us to be successful in passing our genes on to the future.
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