> Indeed, I am really puzzled as to why these
> "jokes" are supposed to be offensive to women.
That's a lot different from a person being subjected to sexualized jokes and comments from strangers.
Your friend gets to choose what kind of friendship she has with you; a woman on a train or at a conference does not get to choose what kind of sexualized comments she hears from strangers.
Surely this is something we can all understand. A lot of guys (me included) will say really rank things to their close friends - explicitly letting their friends know when they're getting fat, jokes about sleeping with their friends' wives and mothers, and so forth. That's all totally cool (and often hilarious) but surely you can agree: it would be a completely different story if a stranger or your boss started making remarks about your weight or how many times he's slept with your wife, correct?
That's kind of what it's like for women when they hear unwanted sexualized jokes and comments from strangers, with the added factors of being minorities in their own industries and living in a largely male-dominated world. Did you know that even in America, a woman has roughly a 20% chance of being raped in her lifetime? (source: http://www.cdc.gov/ViolencePrevention/pdf/SV-DataSheet-a.pdf)
Here's the key thing, though: it's actually not about what you feel. Whether you don't understand, or you do understand and simply think women who feel this way are being dumb, the fact is that a lot of women feel that way. You can respect their wishes and make them feel welcome in our community, or you can choose not to. My personal opinion is that the more of us who choose the former, the better - for us and for our industry.