I never got the sense that Karen was making a claim...they are a very tactile couple (ie him kissing her on the floor after the Crazy In Love group dance was finished or rushing on after she was eliminated) and I kinda get the sense they are always very like that (as seen in her crib ep of ITT last year) and she was proud of him and that was just a natural reaction for them. They just aren't shy about PDA, I mean they got engaged on stage afterall, and for us who maybe aren't used to seeing one of our pro couples like that it may seem odd.
I get what the post is about though and I agree in a lot of ways - not so much with the professionals but more with the celebs - I think if you're not used to the intimacies required in dancing that it may, in certain circumstances, lead to confusion although I do think that over-simplifies it as well because i do think that there has to be a conscious effort to ~forget that it's just a professional relationship in these situations as well and the ones who make that effort would probably have found an excuse to do so in their day job environment as well.