Another thing, in the first place, how derpy first showed up, no one was making fun of her, in fact bronies loved her. They thought derpy was funny and cute, and bronies got mad when they blocked derpy out. Not even sure why some one would dislike derpy.
I totally agree, if some one dislikes derpy that is their opinion, every brony has different likes and dislikes, if you don't like a certain pony, that's fine and they have the right to state their reason if they wish.... obsessive hating or "flaming" is not necessary and is just stupid, same goes for the complete opposite such as the obsessive fandom that I hear of.... personal opinion, and I am sure lots of bronies can agree. 
I didn't even really think being a brony meant much. It just means you like My Little Pony, there isn't any requirement. It's just a label.
Also agreed, the show was meant for young girls like 12 and under, but I like the show for what it is, not badly written, decent animation, has a day-day basis type of story line, teaches basic lessons about friendship, and best of all the humor isn't terribly corny or boring... and I forgot to mention just to stay on topic, Derpy being more or less an easter egg that wasn't planned.
So I don't see why not to watch it... unless you don't like it of course.
I sadly don't call myself a brony because the majority of them are hypocritical and shove the fandom down other peoples' throats and complain a lot. I don't really want to be grouped in with them.
As true as this is, you can't assume they are all like that, but what do I know about fandom, not like there isn't enough of it around for every popular anime, tv show/series, video game etc. If some-body, not some-pony, wants to call me a brony cause I watch the tv show and like the animation, fine I don't mind the use of the word but if you insult me by saying I am wasting my life and I'm a F*G cause I like MLP... you won't see me doing a reno to your house, or fixing your stereo and TV.
And to finish up... since I overkilled the quotes now... if you don't like the fandom, then don't follow it or even acknowledge you see it, amd when you want to hate... sometimes you just gotta bite your thumb and let it happen, like I should have now lol.
As for Derpy Hooves, I think she needs to be given a rest and let the producers decide what she should do next but everypony seems to be taking this too seriously IMHO 
I'm glad this thread didn't turn into a flame war, and just to keep an open mind feel free to correct me on anything... or hate, whatever lol