If you hate a client but are still prepared to work with them then make sure you don't lower your standards. It would be easy to lower them out of spite, but doing so will only serve to ruin your reputation and ethics.

I myself, would never work for a client I hate, as hate is a very strong word. To me it means a lot more than someone I just dislike, it means they would be someone I wouldn't think twice about smashing to a pulp if I had a chance.

Consider each client carefully, are they able to help you further your business, or will they just drag you down?