How do you feel when your ideas are denied in public?

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An important meeting was held this afternoon in the company.They were talking about how to make a new plan for the sale of next month.The manager set up the goal for his teams,and required the members to give ideas about how to achieve the goal.The first person stood up,and talk a lot.However,as soon as he finished his talk,anther person stood up immediately,and said that the first person's idea was not good at all.He was offering his ideas excitedly,without noticing the first person's face was changing. As the second person was talking more and more,the first person could not stand it any more.At last,he decided not to bear it any more,so he stood up for the second time,and shouted at the second person.An argument took place. So guys,have you ever seen such affairs?How do you feel if your ideas are denied in public?If you are the person who is going to deny other's opinions,how will you express your opinions?