No I'm not talking about something being easier or harder than something else. Forget about comparing for a moment. Is questioning her gender is something racist?
In Asian U18 football matches, Iran and Oman (not sure about Oman though), had some players who were obviously older than 18. It was obvious from their looks and appearances. Some certain players were tested (some X-ray tests and stuff) and it appeared that they were +18. We were punished heavily but since then, ALL the players who are taking part in the Asian U18 competitions are first being tested on their ages. Our players' looks was something which made the AFC authorities suspect they're really under 18. This is why they tested those players.
Now this girl is looking like a boy. Her looks, her muscles, her strength and speed, etc. They want to test her gender. What does it have to do with her color?