At one point when talking to D in The Crooked Man, David reveals that he is color blind, which ultimately led to him failing to become a pilot. The Boogie Man elaborates on this, revealing that while he can see red, he has difficulty with white and pink. This would suggest that he specifically has Deutan Color Blindness, where it is common to confuse pink and white colors (particularly in cases where the pink is akin to a light purple).