Perhaps I'm reading too much into it but I can't believe Apple would be so undignified and sexist as to use a blonde joke in an ad.
Well no, they'd just use a brunette. Some people will still say it's sexist but I don't think it would work having a guy using the pregnancy test.
You have to be allowed to portray scenarios. If you decide you can't have a stupid woman in an ad, then you have to also decide you can't have a stupid man in an ad otherwise that's sexist. So then Apple's Genius ads are sexist because they suggest middle-aged guys aren't smart enough to have basic computer skills. Nobody calls them sexist despite only portraying middle-aged men requiring Genius assistance.
Apple gets a pass to portray some of their customers as stupid in need of help but when Samsung portrays scenarios, all of a sudden their portrayals have to be applied to everyone. They should get the same treatment. I didn't like the Genius ads because I didn't think they were funny and they suggest some of their own customers are really stupid. Similarly Samsung in their 'line' ads suggest customers they hope to persuade to buy their own products are deluded and gullible, which isn't a good move.
There are limits to how much advertising should cause offense but the level of political correctness that goes on these days is a little tiring and I think Apple is becoming too politically correct. Back in 1984, they were small and trying to get some footing against Big Blue and having a disruptive advert made the impact. Although Samsung and RIM are big companies, they have to be more disruptive and risky in their advertising in order to get that mindshare instead of Apple.
By all means they should be criticised for poor execution but I think they should be allowed to have some creative freedom too and I'd say Samsung's marketing is better than Microsoft's and RIM's. Even if it offends people, it's better than bland marketing because people talk about it. This is an Apple forum and Samsung is being publicised unlike Microsoft and RIM and guess which ones are selling really well. It has a lot to do with the products I know but the brand awareness comes along with this publicity.