Warning: Actual Question!

I think some of has to do with the age group and gender which the montrer is mainly targeted towards. A lot of people associate certain scenarios with a gender role schema, which is basically the framework which is associated with a certain gender, and is how some of us gain feminine and masculine traits. Thus, if something falls out of our known schema, then we have an issue with it. It's foreign to some, and downright strange to others.
As for the seconde question, that is something that has been with humans for a LONG time. It's really hard to say why it's done, but mainly it's due to the fact that something probably happened in someone's childhood thus causing negative feelings towards something.
That's all I can say in the matter. And sorry if I'm being over scientific ou something. orz

Because people suck.

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I can't answer I hate both... Okay, hate is a strong word, they annoy me (only the hardcore ones) because they just can't take it if someone dislikes their dear ponies and therefore get easily butthurt and start insulting toi like dumbasses. But hey, I'm fine with the normal fans.

Maybe its because MLP was directed towards girls and then boys started watching it too. Then others thought the they were gay... Idk its just a guess. Why can't we live in a world where people can be themselves without being judged par strangers!? I support Bronies! X3

Because double-standards are stupid. :(

Here.

I personally don't mind them. I know a few I'm Friends with in real life

Because nowadays, the males are supposed to be all manly with 'Call of Duty' and all of that.. :/

Because alot of bronies are crazy. REALLY crazy and they are pretty much giving themselves a bad name but there are some good awesome bronies though. Another reason they get hate is because of stereotypes and sexism.