Good points: I've also noticed that women take much longer to get their card/cash out and pay for the transaction. My experience is that typically (though not always) they take longer to order, as well.

I wonder if part of the "contempt" aspect is not so much discriminatory in the classical sense, so much as men are probably more likely to give the impression of menace, and in general are more impatient, should the service be slow. In other words, barristas are serving the men more quickly because they feel more pressured to do so, and in the case of male barristas it's more "Here you go, bro, I know you hate to wait." So it's not that women are getting short shrift because they're women--they are getting "normal" excellent service; it's that men are getting "on the double" service because they're men. I therefore wonder if they'd find that men's drinks are overall lesser quality because they are rushed.