I don't think Simon's argument has to do with adhering to American standards. In fact, he explicitly states that he's interested in creating an "inclusive environment" for women developers.
How quick are we on Hacker News to pass judgement on Google for censoring search results in China? Why aren't we defending their actions in the same manner that some are defending the decision to include lap dancers? I think it's because we sense that there is a greater issue at hand, and that is precisely what Simon is saying here.
Forget whether or not Yahoo has the right to hire provocative dancers for their conference or even what the norms are for other conferences in the area. Those things have no concern for the feelings of women. Even if Yahoo can and others do, it doesn't mean it was the right decision.
> Those things have no concern for the feelings of American women.
Sorry, I've edited your quote. You're still projecting your morals onto others. See my response to your sibling. ( http://news.ycombinator.com/item?id=891269 ) You won't change hearts and minds with a message of "You're wrong."