Question

why did some whites believe that the african american protesters in montgomery were behaving arrogantly

Answer 1

Because it was against common belief and they didn't want African Americans to be free like the whites

Answer 2

Some whites in Alabama, consider African American protesters to be acting arrogantly because whites were not used to such protests in America. Whites also did not want African American to have the same rights as them in America. African American according to the whites, were not equal and meant to be controlled by the whites rather than to be free in America.