What the author described was more than “a random man asking a woman out”. She describes an environment where getting hit on/unwanted advances/lewd comments are the norm. Sometimes it’s blatant misogyny (“If I give you this investment, what are YOU gonna do for ME?” That kind of stuff). Mostly, it’s a general atmosphere of men crossing boundaries that shouldn’t be crossed in a professional environment. It happens often enough that it makes women uncomfortable. They want to be there to work. Not attend a singles event to be ogled.
Of course, no one can speak for all women. But if you ask around (like the author did), you’ll come across similar story after similar story. Just because it hasn’t happened to you, or you haven’t seen it, doesn’t mean it doesn’t happen. You said I don’t know what their wishes are. And nor do you. And nor does a typical coworker. This is why we need to find out what their wishes are before making assumptions.
The example you gave of a man lightly coming onto a woman after a few months is a perfect example. If there have been social cues indicating interest, and as long as there’s no expectations, then of course that’s okay.
But what the experiences of many women indicate is that in business meetings, interviews, office lunches, and other professional settings, men are consistently acting in an unprofessional way towards women. Most women don’t like that, and it’s causing them to leave their companies/industry.
Even the nice man described above — if that situation happened regularly and often, it would grow tiresome.
The point is: women are having these experiences (and its more than innocent flirting). You shouldn’t just deny that experience. Just believe them — it does happen, and it does make them uncomfortable. Why is it so hard for many men to just acknowledge and respect that?
Lastly: you misunderstand the term “feminism”. Do you think women should be treated equally to men? Congrats! You’re a feminist! Most people are; they just don’t know it.