I actually don't think the repeated comments on here that "you can only buy blue or pink toys/clothes" and "girls are forced into a pink box" are very helpful, because they're not true. There is a hell of a lot of this stuff about, but also millions of other toys and clothes, and you don't have to try that hard to offer your kids gender-neutral toys and a range of clothes colours.
I do agree that gender marketing has become much more polarised over my lifetime and that it does affect perceptions of what girls and boys can do, among some kids and some parents. It's something we need to fight. One way to do that is to make sure your DC realise that everything on offer is open to their choice, and make choices yourself without emphasising any gender bias or distinction.
Sainsbury's, Tesco, Next, Gap, Boden, H&M, are just a few of the mainstream clothes makers where you can get a huge range of colours for both sexes (including pink in the "boys" section) and many of those clothes are very unisex. As someone with an older boy and younger girl, there's very little we've bought for DS that isn't handed down to DD to wear. When she helps to choose her clothes in a shop, we look round all the clothes and she chooses what she likes - she's chosen lots from both "gender" sections.
Toys are the same - it's nonsense that there's only pink and blue. It does happen, and there are some dodgy gender-divided items (ELC I'm looking at you) but are you really saying there are no orange, yellow, red, purple and green toys? - of course there are. There are also millions of very unisex toys - most lego, our multicoloured marble run, toy animals, snap and similar games, magnext, playmobil, ikea model railway are all equally enjoyed by both my DC and any kids that come round.
However even if toys (or yoghurts) seem to be marketed in blue and pink colourways, it's our job as parents to present everything as if it is unisex anyway (because effectively, almost everything in life actually is unisex. With the exception of childbirth and breastfeeding everyone has the choice to buy or do anything their budget/ability/imagination allows).
If you see pink and blue yoghurts that DON'T say boys and girls on them and you sigh "Bah, boy and girl yogurts" I think you are part of the problem tbh.