Bevendre

This is true for Papi’s canon on a number of levels.  

Because of their appetites and feeding habits changeling society is much more socially open and direct than many pony communities, with relations generally being more open and acknowledged.  This of course can lead to some awkward situations among converted drones.

The hatred of changelings by the bulk of pony society has less to do with ‘haters and religious leaders’ however, and more towards a long standing prejudice and fear based around the changelings’ appearance, misunderstandings of their modern behaviors, and terrible wive’s tales of their ancestor’s behaviors.

The first of what would become changelings were much more monstrous creatures in their behavior, consuming most organic matter in an area before moving on, leaving it stripped as though they were locusts.  These areas would often remain barren for some time, leading to the Changeling Wastes on the outskirts of Equestria, and any pony or other sentient caught during a hive’s passing would generally be consumed and converted through less savory means than Papillon exhibits.

The first changelings were visibly horrifying, and that was reflected in behavior, generally being more feral than sapient, and behaving more akin to their parasprite relatives than their pony relatives.  These times led to changelings being demonized as a plague and blight upon the world, and as such led to many attempts to remove them from the world they feasted upon.  And so, ponykind, under the leadership of the royal sisters enacted acts of genocide and attempted to completely eradicate the changelings.

These acts of course led to much bitterness between changelings and ponies, especially as the changelings were forced to adapt rapidly through accelerated generations.  Modern changelings are much different than those that were first hunted near extinction, but even the modern changeling bears fear of destruction and extinction under the hooves of ponies, especially after Chrysalis’s folly.

This is what makes Papillon’s gambit very dangerous.  She seeks peace between the changelings and ponykind, and it is possible to establish it, but even if changelings are understood as loving and sapient creatures, there will still be a LOT of prejudice and hatred to get over.