@ fred weasley,
the same reason I used to hate ManU is the reason I am beginning to feel a strong disafinity for Chel$ki.
Call it jealousy or whatever you want, but one of the strongest emotions that I feel as a person is loyalty. I for one have supported Juve since I was 4. My closest friend has always supported Liverpool for as long as I remember. Yet another friend of mine supports Bendel Insurance, then there's one who supports Milan, and we are still great friends!
I know a girl who has been a Chelsea fan since 1997, and even she is getting pissed now (not at the club mind you).
Reason: Ever since Roman came with his billions, Chel$ki 'fans ' have been coming out of the woodwork. Same as we suddenly had a million plus ManUre fans in 99. Such people get on my nerves, really. And sadly, there are many of such around these parts.
In my case the irritation and annoyance I feel for such people comes to the fore on match days, when their so called club is playing. I then support the opposition.
That is my definition of hate for a club.