discrimating or doing his job?

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I was at the train station a while ago. When I was in the train, during the trip, the security roam the in the female area. He then saw this person, he then asked DIRECTLY if he/she was a female. When the person said he was a gay, he told the person to leave (in a loud voice) the female area and proceed to the male or the unisex carriage. Take note that guard did not let the train move from the station if that person did not go their. If i was the person, it would be really embarrassing for me. It is humiliating because it just stopped and won't go unless moved. It may be then that the guard was only doing his job but i think that was too much. Then the train that time was not even filled up, so think it's actually alright.