So we saw them arguing on the LF earlier, and from what Michael and Dexter has just been saying it sounds like it was cos Jemima was chosen as 'Least hygienic' but refused to wear the placard because it would damage her career and business or something like that, so Dan thought she was being selfish for compromising the task and making a big fuss of something quite trivial when Wolfy was really upset at being called ugly
Think that was the gist of it anyway, though Dan was also interrogating her as to why she thought he was two faced about something