IMO, calling out racism in MLP is a lot like calling the fact that males almost never get pregnant in fiction sexism.
Not... really. Assuming I've actually understood what your saying (I lost some sleep last night), the difference is that realistically, there would be some sort of divide between pony races. I mean, you can't call guys not getting pregnant sexist because it just plain old
doesn't happen. It's biologically impossible.
There's no evidence of it happening in show, and that's to it's credit - there's really no need to show that to little kids. But the fact remains that even if their society is egalitarian, on the surface an earth pony can't do anything that another race couldn't do, and unicorns and pegasi both have something on earth ponies. It's almost impossible that they wouldn't be looked down on even a bit - even if it's only just 'recognition', like recognizing a man in a wheelchair couldn't climb stairs. Yeah, they
could do it, but thatwouldn't stop anyone from thinking they couldn't.
Basically what I'm getting at is, do you think there's any chance that earth ponies are seen in-universe in the same way that the fans see them? As having got the short end of the fantasy-stick?