Why? Do LDS dislike Baptists?
Different religious groups are OFTEN (in fact, almost ALWAYS) rivals of each other. Baptists believe Mormons are going to Hell, and vice versa. What planet have you been living on?
All Christian denominations deny the LDS as fellow Christian brothers, but Baptists first went further to label them a cult.
As such, the use of the Baptist buses is a poke in the eye to Mormonism.
Good.