Never. I will however be cheering for Haye to knock him out. Ruiz has disgraced this division with his illegal and unsportsmanlike antics long enough. Time to end it.
I cheer against Ruiz no matter who he's fighting and this (proposed) fight will be no different. I'm a big fan of Haye already but if he finally ridded the Heavyweight division of Ruiz I'd like to think he'd convert a few more people. Even if you hate Haye, surely you would rather watch him, rather than Ruiz, fight?