From what I saw on the C4 show, Jonny was egging Kate on in a drinking game when she did not want to continue.
Being male Jonny is not effected as much by alcohol as much as Kate is, being female. The department of health reccommend that women drink less standard units a week than men (20 for men 14 for women). There is a biological reason for this but I don't have access to it at this time.
Jonny was not very nice in making Kate go well beyond the limit. (Just something for those thinking about voting for Jonny to consider)
In a twist of fate, Jade was relatively sober in comparrison.
