Couple in this particular thread means either a married couple or a dating couple.
Now, since I do follow another reality TV show, I'd have to say the answer would be no.
Purely, because there is one that really stands out that is
much worse.
That particular couple happens to be the (still) married couple of Jonathan Baker and Victoria Fuller (former Playboy playmate) from Amazing Race 6 from late 2004.
One of their most infamous moments is in the video below (it occurs between 4m45 and 5m35 of that video), which is one of the more controversial scenes ever shown on national television...
After their appearance in the Amazing Race 6, they appeared in a Dr. Phil special about their relationship.
Even after their appearance in the Amazing Race and Dr. Phil, they also appeared in a Fear Factor episode, which also had a controversial moment involving them.
Can you think of a reality TV couple worse than either Jon and Kate or Jonathan and Victoria?