I can't tell due to my very narrow range of stories I actually know anything about, but what I'm getting is at is this:

Stories about enslaved humans rising up against their oppressors, which just so happen to be non-human entities of some kind (elves, aliens, lizardpeople, dragons, what the fuck ever): Cool, noble, inspiring and good.

Stories about enslaved non-humans rising up against their human oppressors: Not good, very bad. The heroes need to put a stop to this evil uprising.

So is this actually a common thing others have noticed or am I just making assumptions based on my very limited knowledge?