I feel that there are five points here that need addressing.
1. Women rarely become attractive by doing nothing. We have to work at it. You have to take care of yourself, go to the gym, eat right, choose appropriate clothing, and etc. I have never laid eyes on Rebecca Lovell, but if she's attractive then I think it is a safe assumption that she is trying to be attractive. If I were Rebecca, I would be pleased that my efforts had been noted and approved of.
2. If the fellow who introduced Rebecca had implied that her attractiveness was her only useful quality, I would be more sympathetic to Dan's complaint. But the introduction didn't do that. In fact, he led off by saying how smart Rebecca was, and then he went on to describe her as "perfect" (for the position) and "talented." At no point did he imply that Rebecca was chosen for her looks or that her looks were her claim to fame. On the contrary, his introduction seems genuinely kind, respectful, and affectionate.
3. Even if this introduction had been offensive -- if the introducer had said "Rebecca is hot and stupid and we will enjoy looking at her while she moderates" -- is it really that big a deal? Men insult each other all the time in similar contexts, and it's very rare that they get criticized for it as when women are insulted. If we women are worth a damn, surely our egos should be sturdy enough to handle this sort of thing like adults.
4. I have often heard men say "No wonder there aren't more women in tech; they get treated like sex objects!" It should be news to no one that men like sex -- least of all to women. People in all industries and with all interests are insulted all the time. Can it really be true that womens' interest in tech is so fragile and tenuous that vague insults and sexual innuendo are enough to discourage them from it entirely? I don't believe that, and I'd further venture to say that women who do say that are just making excuses because they're interested in something else. I got my CS degree from Georgia Tech, and in the College of Computing men outnumbered women 9 to 1. I was often the only girl in my classes, and sometimes I was exposed to immature male freshmen being immature male freshmen. This wasn't a trial for me; it wasn't difficult. I wasn't alienated. It sounds crazy to even consider that references to breasts or sex (gasp!) would make me leave my chosen field of study. Who cares if I know that someone wants to have sex with me?
5. Dan Shapiro is clearly trying to do right by women and be a good man, and I respect and appreciate that. But I think he is selling Rebecca (and all women) short by suggesting that that introduction should hurt her feelings.