Fan bases are often the catalysts of any sort of animosity towards a particular team. Kentucky is no exception in this regard.
Because of its tradition and prevalence in the Bluegrass State, Kentucky boasts one of the most passionate fan bases in all of sports. Kentucky basketball is more akin to a religion than an interest or hobby.
Basketball is admittedly the state's biggest export, and residents are bred and raised with it always in mind. For this reason, Kentucky fans appear to be of a different breed.
Because of their ardor for their team, Kentucky fans can often come off as rude, arrogant or just plain crazy. This is no unique phenomenon in sports.
Kentucky fans are often criticized for being either way too knowledgeable or not knowledgeable enough about the game of basketball. Yet, while knowledge levels may very, all Kentucky fans share a certain intense passion for their home-state team. This passion often comes into conflict with other fans who are equally as enthusiastic about their own teams.
In fact, most of the reasons already listed are only amplified by fans' eccentricity. Without Kentucky's outlandish fan base, the Wildcats would not be nearly as successful—or nearly as loathed.