Based on the article, she might have been hated not just disliked.
She said another employee had asked her: “Are you taking the piss, Karen?” The tribunal heard that this was after Conaghan suggested she had “done all of the hard work” and it was his “turn to do some”.
It’s basic decency to me. You don’t have to like someone to be courteous.
Maybe it has different social significance in UK
No it does not. Left plenty of crappy jobs without ceremony
Based on the article, she might have been hated not just disliked.