Extremely Hot Model

Mr. Maserati looked at Ford in a confused manner. It was confusing for him too in the start when he saw Moon B. Xiao for the first time in the cafeteria today and realized that the person Ford was talking about at their meeting a day ago was actually a girl. It was confusing because Ford had kept referring to this new junior journalist as a 'he'. 

He put two and two together and came to a conclusion that the confusion may be because of Ford might not knowing much about her and that is why he generally thought that it was a guy. 

However, Ford's reaction now at finally meeting her in person and finding out that the 'he' is actually a 'she', is making him confused with a question. Why is he reacting so strangely about her being a girl? Why was he so certain that it was a guy; why did he even thought so much about Moon B. Xiao at all?