A lot of people have been called sexist for disapproving of the choice. I for one do so as well.
I don’t really know Whittaker so I wouldn’t know how well she acts but that isn’t it. The thing is, after watching doctor who you will find the doctor has a regular pattern of displaying his emotions. They are displayed through a man and in the way of a man- in a literal, and not in a stereotypical sense. People are defending the doctor disagreement with Michelle Gomez but the thing is, she was only the second version of the master we have seen since 2005 but the doctor is the 6th version. If older fans display similar reasons for dissaproval think about how they would feel. It isn’t fear of change, but a dissaproval of what has been changed.
If I am right in saying this then I hope she will come and go as quick as Eccleston