As a comedian, Kerry enjoys coming to work because in her job she's allowed to be sarcastic. One could say it's even required. She used to express a lot of sarcasm at her old job but it's not much appreciated from an elementary teacher.
Sarcasm is very popular in Britain had often creeps into situations where it really doesn't belong such as at the dentist or at the gym.
She also humorously explains her beef with credit card sales pitches. How can anybody be expected to understand the terms and limitations at the end of a credit card offer. Would anyone tolerate that kind of approach from a date.