I don't think they don't *Like* each other, if that were the case they wouldn't have been able to work together as well as they have for the past 14 year. They admid they aren't 'Buddy Buddy' with each other, but they have had a great working relationship with each other which has led to 14 years of a unique show.
Granted they have different outlooks on things and are different personalities, but the working relationship has been great over the years and, while they aren't exactly gonna have a BBQ and Buds with each other, I think they have a level of respect for each other that has enabled them to work very well together on the show.