I dislike Applejack.

Why do I dislike Applejack?

1- She's the only pony which you could label as "American"; because of that Southern accent, thus she is marketed for the audience of the USA. 

    Non-American MLP fans exist too. (For example, moi.)

2- She's uncouth, stubborn and ignorant.

I used kefkafloyd's color guide for Applejack.

Edit: I've darkened the text.