He's the one who shows love, care, concern, is thoughtful
No he doesn't. He's a little dick who torments his sister and wrecks her stuff - and there's nothing materialistic about being pissed off that your shit of a brother has ruined your belongings!
I am honestly not seeing the sexism here, unless you want to argue that the advert is aimed at middle class, middle aged women. Which is undeniable, but that's M&S's demographic. It's a bit like calling ageism when toy adverts feature kids.