Is being emotional at workplace alright? Is it true that women are overly emotional?

I was talking about this with my friend and how she feels about her emotion at workplace during lunch today.  She had been working on a proposal for the past three months for the client as her boss asked her. She used to stay late in her office, wake up in the middle of the night to write down her ideas. Her boss had several options that she had planned for the proposal however she felt that hers was the best since it was the most creative and rewarding. During her meeting last week on Thursday, she presented her proposal. The meeting goes well for her despite the fact that she was so nervous that she did not have breakfast. On the same day, after the meeting she was called by her boss in the office. She was told that her proposal was good however the conservative way of the boss would work out the best for the client. She makes it in her office without bursting into tears. She was really excited and passionate about her proposal just to know that the boss did not accept it. She took it personally because she had worked really hard for the past three months on this proposal and it all went down the drain. Is this being too emotional? I believe that most of the men would feel the same way however instead of crying they would have probably used bad verbal language to take their emotions out. I do not believe she is more emotional when compared to men. It is just that the society is structured in such a way that it accepts when women cry but it does not when men cry. Men are seen as the thinkers and women are seen as feelers. Do you think what my friend did was overly emotional? Would you have reacted in the same manner or different?