Coleen went into the house with an opinion of Julie from her equally vile sister Linda (who had a run in with Julie in the past) so it was her not Julie who had the problem... Coleen was also pi**ed off as she thought she would be the 'mother' of the house & 'Queen Bee' when both those roles went to Julie (who she already disliked). Coleen is a bitter, manipulative, miserable hag with a huge chip on her shoulder. She has never got over Shane Richie cheating on her & from how she has been in the house I can understand fully why he did...
Coleen & Martin are far more bitchy & two faced than Julie