The reason why certain right wing orthodox men want women to sit in the back of the bus is the same reason women and men do not sit together in synagogues. Its about extreme adherence to religious separation of the sexes and its not about bigotry against women. That being said, such separation should not apply to public transportation and if there are religious sects that feel that there should be separation of men and women on buses such groups should do what they do in Brooklyn, hire there own private buses.
Poland's central bank head calls story of Nazi train find a hoax (Reuters)
from the article: Israeli woman refuses ultra-Orthodox dictate to move to back of bus