People get quite excited by this and scream at random company Directors. But ultimately most of this s**t is made in China by people with little English and little understanding of Western culture. The stuff online, in particular, is frequently fulfilled by external companies and done through automated databases, and there might not be the involvement of anyone at the supermarket, or if it is, only menial clerical work.
The Asda one was a zombie costume, incorrectly titled as a mental patient costume, and there was nothing wrong with it, except a clerical error made by some lowly-paid person somewhere.
The Tesco one was not even Tesco, it was a third party company called delights.co.uk, who use the Tesco site for orders.
I recently bought something from Tesco that came from a third party company. It was the wrong item (wrong model number), and I returned it. The third party company who did the dispatch told me that the wrong part number had been entered on the Tesco site.
There's no great conspiracy, as is usually claimed, to make squillions of pounds exploiting <insert sensitive cause of the week>. It's just a big ecommerce website selling lots of stuff with only very light oversight. If you find something wrong, and you can get through to someone who isn't an underpaid drone, then they will get rid of it.
