For the record, red was considered a boys color because it is a variation of red, which was a "strong" color. There was also a superstition that spirits/monster/what have you will come and steal your boy babies, so to protect them, you'd put babies and toddlers in dresses (there's some pictures floating around of baby Roosevelt in a dress, I think.) But, to tell the boys from the girls, the boys would have the pink dress and the girls would have the blue dress.
Eventually, as the whole "dress your babies in dresses to protect them from the devil" thing faded out of style, they had a ton of pink dresses left. So it became a girl thing.
I never really understood why people were so weirded out by pink tools, honestly. People often like having the majority of their tools match (literally everything Ryobi is this obnoxious neon green, DeWalt does the yellow, Milwaukee is red) because every brand designs their stuff to be used as a set. You just pick and choose the pieces you need of the set. So a reciprocating saw from Milwaukee may have a set of interchangeable blades that don't fit in a reciprocating saw from Ryobi. Basically, a wall of pink tools just means that someone is jumping on that particular brand's tools. (this only really applies to electric tools, however)
Related but off-topic: does anyone know where to find a goddamn flathead screwdriver that has a metal cap on the end that goes through the entire handle, as opposed to just being an extra cap on the end? The extra caps just come off after hitting it too many times.