That's how I feel about animals. I don't wish them harm, but I don't want to be around them and I generally don't like them in tv shows.
As far as kids are concerned, the younger ones are often very bad actors. Not saying that teens are always great actors, but they're usually not so bad that I wish they weren't on the show.
Although most of the teens on shows that I watch are actually played by actors in their 20s.