Because like Maru said...Andrews bitching is more slanderous...the others are more passing comment which is human nature.
Andrew and Shane J spend a lot of time in their smoking area bitching..Andrew more than Shane j. Andrew has called Jonny uneducated amongst other things..Andrew has called out Ashley and G for the 'showmance'. Andrew has vilified Ann on many occasions..he is the biggest bitch in there.

Hopefully the girls win and all the boys go up.

it can't be denied that he has played a good game if he has been able to keep the hm's on side while disrespecting and undermining them behind their backs. Where that strategy fails is that the public see it for what it is and I trust that public to boot him out whenever they get the opportunity. If that means its the final, so be it

Andrew is the epitomy of sneaky, he puts on a lovely friendly ,fun ,face to the housemates then skulks of with his mate to pull them apart.