I'm sorry that's just retarded. You have to separate them. Just as you have to have weight classes for certain types of sports. Women (as a group) will never be able to run as fast as men (as a group) because men have bigger lungs. Bigger lungs means more oxygen going to muscles which translates to a higher level of performance. It's not about sexism it's about physiology.
Which is why proper classification for this runner is being questioned.