I don't doubt her experiences - I have no trouble believing that people are more likely to ask black women if they're lost. IIRC, this kind of stereotyping is well-documented.
I do take issue with her blaming the CS107 professor for contributing to sexism. She seems to be saying that CS107 is discriminatory merely because it is difficult and many people drop out. She notes that women seem to drop out disproportionately often, but this might not be something the professor has the power to do anything about - she certainly doesn't say anything the professor does which might be part of the problem, other than just making the class hard. Watering down core classes in the name of increasing diversity doesn't help anyone.
I do take issue with her blaming the CS107 professor for contributing to sexism. She seems to be saying that CS107 is discriminatory merely because it is difficult and many people drop out. She notes that women seem to drop out disproportionately often, but this might not be something the professor has the power to do anything about - she certainly doesn't say anything the professor does which might be part of the problem, other than just making the class hard. Watering down core classes in the name of increasing diversity doesn't help anyone.