I wish stuff like this would happen to me when I get misgendered. Sadly, most of my friends won't use my pronouns (they forget and I'm too nervous to correct them.) Only two people (my best friend and my ex-girlfriend who I'm still good friends with) actually use my chosen name and pronouns. I love those two to death.
Selfridges aims to hit everyone in the market so they sell a wide range of FASHION, FAD and BASIC products. It very much depends on the brand they are selling. The high end high street brands that are in Selfridges sell a lot of their popular fashion items with a mixture of basic where as high end fashion will sell their Fashion and Fad items.