Baptists (or rather Dominionist Baptists, which composes almost all of Baptists in this area) hate Catholics because they're not Baptists. And they think that venerating saints=idolatry. They also think that if there's a remote possibility you enjoy anything more than praying, that's idolatry too.

...Yes, really. There is no logic in Dominion theology. >_>; They probably think that what is currently known about the history of Christianity is really a trap sent by Satan to lead you off the True and Righteous Path (TM, patent pending.)