Haven't met many, but the two people in my game group that are or were bronies were pretty easy going, once you got them through the "defend the fandom" phase.
What I mean by that, really, is that I noticed in both of them a need to defend what they loved about it and why, and to encourage (almost to the point of demanding) people to give the show a chance. I think it stems from being in online communities where it carried a stigma in the early days, honestly.
One person isn't in my game group anymore, because of scheduling, but the other has mellowed right the fuck out about it. For one part, he's become disenfranchised calling himself a brony because of how much he sees in the community of people acting like the show/products should be catered to their tastes (or specifically where they seem to be). The other is he's just mellowed out, because none of us really care as long as you aren't demanding we be bronies too. To top that, another player is a Twilight fan (books not the movies, because apparently that distinction matters), and another is a fursuiter. No one cares unless you try to make disinterested parties participate.
For full disclosure, I did actually give the show a watch; the pilot anyways. I found the animation well done and the characters/stories well written for the age group it's aimed for, but clearly not for me. I kept having issues with things like transparency of moral, thinness of characters, and basic issues of biology and culture. Not points one should be nettled about during a kid's show but, again, it wasn't for me.
The one who is still in my group made the mistake of letting it slip that the blue/rainbow one creeps him out, because of its prevalence in the porn imagery. Whenever we get him a gift, my wife always tries to get him something of that character for a laugh.