Seeker, are you perhaps of a "later vintage?" than I was?
When I speak of wearing more "gender neutral" clothing as a child, I didn't see these as either masculine or feminine. The only garment worn by one sex and not the other would be a skirt or dress. For the most part, this was only for church or "fancy" occasions, and rarely in pink.
Here is a shot of kids in a playgroup in my local village around 1974. The photo is quite faded, but one can see a range of colours and clothing styles on boys AND girls. The only two children who appear to be wearing pink tops are the young boy and girl at the front on the left!
This is a children's party in the village around the same time. Again, only one girl seems to be wearing pink while four are wearing wholly blue tops.
And here is a school classroom around 1971. Again, primary colours but no pink on the girls.
I do think there was a relatively liberal "culture" in education and childrearing practice in the 70's, where at least some teachers and parents made a conscious decision not to perpetuate gender, racial or disability stereotypes. Doesn't mean it was an egalitarian paradise at all! But even in the extremely conservative community I grew up in, there were books, toys, materials, etc. at least in the school that were more "representative" and we looked back and laughed at some of the depictions in books from even a decade before, still in the dusty corners of the library.
The point about the cost of the bicycle though is relevant. I don't believe that all manufacturers of toys, books, games, etc. are deliberately setting out to create gender discrimination. I think many will have grown up in a time when they were told that discrimination was a "thing of the past," so probably aren't focussing on the potential negative impact of their products. However, I think they are more motivated by the desire for profits. Why sell only one bicycle/baby bed/set of clothes/etc. to a family that can be passed from one child to the next? Why not create a demand for two lots of these products by making parents think that the same product will not be suitable for a boy AND a girl.
I don't think this is necessarily a good thing in terms of use of financial resources, or the impact on the environment of so much extra waste. Also not good in creating "segmentation" of the market which reinforces gender stereotypes.