one of the reasons why i appreciate the doctor standing up for bill is that back when i saw the family of blood two-part special, i was very disappointed with how the writers treated the bigotry and racism martha faced to protect the doctor, and it hurt me that the doctor never really stood up for her or even apologized after gaining his memories back for practically treating her as a servant. it made him look back. so i appreciate them finally recognizing the type of racism a companion like bill and martha would face and not have the doctor ignore it.