I'm not sure about the title. Animated shows have been doing punny names for episode titles for decades, but recently punny episode titles seem to be an indication that the humor in the episode might be unfunny, for lack a better term. Furthermore, the name "Bridle Gossip" sounds like an episode that plays yet another serious issue for laughs, afterwhich they would try to impart the moral about how gossip hurts other people (which it does, but I digress), and possibly all with nothing else to go for the episode. In fact, I'm wouldn't be surprised if the zebra mentioned in the episode's (ultimately vague) description either didn't cause that disease after all, and/or whatever happens to the ponies isn't actually a disease at all (i.e., with the whole disease claim being the result of gossip).
However, I will watch the episode before I judge. After all, some episodes of this show have been better than others, IMHO.
Cartoons aren't "just for kids"...but they're not just for adults either. They're for everyone.