This is another important point to consider. A lot of people I know don't have any problems with men who like feminine things (in fact, they applaud them), but they dislike the brony fandom specifically because some of its loudest members are sexist, racist, and generally gross.
There is a bad habit among the loudest members of the brony fandom to somehow make themselves seem more acceptable not by fighting the oppressive system which sees them as inferior or strange, but by "masculinifying" the show (and actively putting down femininity in the process) in order to conform to the traditional ideal (in other words, "have their cake and eat it too"). For example: "I don't see the mane six as female characters. They're genderless to me!" or "Hasbro is ignoring their target audience! MLP isn't meant for little girls!"
This creates an unfriendly atmosphere where some bronies feel entitled to the show, rather than privileged to enjoy it, to the point where they are specifically hostile towards the idea that the show was created originally for little girls and that little girls still enjoy it. A perfect example: When Stellar Eclipse was introduced, since he is a Make a Wish pony, the creators of the show kindly asked that the fandom refrain from making porn of just this one pony, since it was the wish of a kid with Spinal Muscular Atrophy type III.
How does the fandom respond?
By immediately making creating porn of this character a game of some kind.
It's sickening.
I think that, with work, the part of the fandom that actually represents its morals - Friendship, honesty, generosity, loyalty, kindness, ect - will be accepted someday.
But the part of the fandom that feels so entitled to the show that they warp it so as to make the fandom hostile to other members and disgusting to outsiders?
Never.
And they never should be accepted.