I'll be basic.
First, this is just a show, everyone who likes it has a different reason for doing so, for me personally, I enjoy the relaxed, lighthearted humor, the characters are also alright, but lately I feel the writers have been becoming lazy. another thing that initially drew me to the show was the animation quality, and the art style.
second let me say that as with all shows this one has it's share of people who take shit too far, and get too into it. these people include, but are not limited to people who DO spam ponies, people who do shove their "bronyism" down everyone's throat, people that are annoying about what shows they like, and people who turn a simple cartoon into some idealistic life philosophy. Saying this, there are "haters" who are justified, but this doesn't mean that there aren't any haters who, just like some "bronies" take things too far.
Over all, I would just like to say that this is just a television show, a 22 minute piece of animation made for the purpose of entertainment, and advertising, and that most of the people in this club aren't the type that take shit too far.