Darren Bennett remarked in the first edition of Strictly Come Dancing book that:
"The deadlines can get very hairy, and that's when your relationship with your celebrity really matters. If they can't take criticism, you're sunk. Luckily for me, Jill and I spoke our minds and swore at each other, and we didn't care. Because she's an actor, she undertands that you have to get it right. None of us wanted to be involved in anything that would make ballroom kitsch or silly. We get enough of that prejudice, and this was a chance to set the record straight."
Both celebrities and professionals are placed into an incredibly pressurised situation. While I do not condone this alleged behaviour, when two people are constantly in each other's space and one of them is attempting to learn a new skill, it is inevitable that tempers will flare up. People disagree all the time and that is a part of human nature. I am not overly concerned about this piece of "journalism" because it is designed to provoke a reaction and to get people reading.
If Darren and Jill can train together, swear at each other then win the contest - I certainly do not see how this would stop Mark and Karen, let alone any other couple from doing the same!