I would have to agree, I don't understand it either, on one hoof, the idea is obvious, its like saying you would date a human as a human. As a pony, you would be naturally inclined to date other ponies. The only way I may even gasp at the logic used by said answer is that everything about them otherwise is human, including their sense of morality and their natural attraction to humans,
but then it makes less sense, as they still think and feel as their human self.
It's one thing to say that you don't find them attractive and would not date them, but "I would date them as a pony?" Unless you meant it as a way to avoid attention or you were afraid that the ponies might not be receptive to human dating, I fail to see where they are going with it.
The problem is, you are thinking that as a human, with human thought, morals, standards of attractiveness, and inclinations.
In other words, it implies that you do find them attractive, yet you cant get past the "different species" barrier.
I think though that the ponies themselves would not see a problem with a pony and human dating, as they have many different species there and I'm sure ponies and griffins, dragons, mules, deer, etc have hooked up, and that it would be no different to them than say, a white person and an Asian person here. (Honestly, they need a Canon pony x non pony couple)
I think by now, most users here know where I stand on dating a pony.