I'd guess it was probably Prawn, that's the favoured put down in many episodes!
I think the word she used to describe Lance was retard. It's probably on ofcom's offensive words list.
One of the Smiler lodging with Norah episodes, she is throwing him out early. He says" I am retired you know ! " She comes back with "Retarded more like !" "Yes seems you're correct its on the list of the most offensive words they brought out in 2016, even nutter and loony are on there as is psycho none of which I find offensive