Why does huck Finn call himself a lowdown abolitionist?

Huck Finn sarcastically calls himself a "low-down abolitionist" because at the time, abolitionists were viewed as troublemakers and outcasts by society. By labeling himself as such, Huck is highlighting his own rebellious and non-conformist nature. It also serves to show Huck's growing awareness of the injustices of slavery and his willingness to challenge societal norms.