1. I'm sure the sales assistant actually totally gave a huge fuck about your pointless talk.
2. Are you RESTRICTED from buying something that is (pointlessly, yes) deemed a "boy shirt" for your daughter? It's not like buying something for the opposite gender and wearing it MAKES you the opposite gender.
3. I can't believe you decided to create a discussion about this.
4. Nobody will give a flying crap.

Thank you, Ilia.

This is a hugely important post, so many clothes for girls are pink and pretty and feminine and frilly but the minute a girl wants to wear something with Bob the Builder on it or a football or a plane, it's horrible and unfeminine. If they want ambition in a supposed "male" oriented field they are ridiculed and often bullied. This bullying starts early on, including in nursery/kindergarten.

There shouldn't be different gender offers in shops, there should be child clothing offers and adult clothing offers. Some men look better in women's cut trousers, some look great in skirts if they can stand the social pressure. Some women fit better in men's cut trousers because they don't have much of a waist (like me) and prefer the androgynous look (not me). We, humans, put far too much emphasis on gender and not enough on the person which is a shame.

Sorry for the rant but my word, I feel better.

There seems to be 2 different issues here. It says "an identical" promotion, not the same promotion. At my workplace we may have 2 for £2 on coke, and a separate promotion of 2 for £2 on lucozade. People will try to buy one of each for £2..."they're both 2 for £2", but the discount won't apply.

The Sales assistant shouldn't really be passing judgement on the OP's daughter's tastes, and people should be free to wear what they want, regardless of traditional gender roles, but the OP concedes that her daughter may change her tastes as she grows older, and seems more concerned about the money than the discrimination.