I saw a flawed pony with a slight disability. All the ponies are flawed and so too is this one who also happens to have a disability.

There will always be dicks online who point and laugh at shit but the show is for kids and it might make them feel good that there's a character that's different like them.

Kids are smarter than people give them credit for and changing it could send another message to them that there's something wrong with them.

And, as a side note, how is that pony any different than this? If anything they turned her into a classic cartoon trope and they weren't trying to be malicious or hurtful.