a)Silicon Valley does NOT represent "business". Silicon Valley is, by far, the least equal or mixed group of companies and corporations. There are very few people who are working there that can't be defined as "White Male", and even fewer in a position of power.
b) Change the situation - instead of trying to drum up business for a company, imagine she's trying to get donations for the school raffle, or is asking people for some help with her taxes. Does that make the story any more unbelievable? No, because "misogyny in business" isn't actually the issue. The issue is the objectification of women to men of a certain age and social class.
You will find that women are being hired at a rate of knots and are promoting up the ladder at record speeds all over the world. There may not be many female CEOs just yet, but give the ladies a chance - it takes most men over 30 years experience to get to that level, and they don't like vacating their spots if they can help it. Even with that situation, women are fast filling up board rooms.
Will a woman encounter challenges specific to her gender, often by men? Yes, of course, because short of executing all men and starting again, there are going to be lots of throwbacks and fools still kicking about. It'll take more than a few years to unseat several generations attitude towards women, but it will happen. The best thing men can do now is encourage, not be sexist dicks, and call out bullshit like redpill or MRA whenever we see it rear it's ridiculous head.