A Brony explains why fans say 'neigh' to Princess Twilight:
And that's it.
That's the meat of the entire article.
That's the reason.
So this is what it boils down to: Bronies identify with Twilight because she's nerdy, but princesses are terrible, therefore Twilight turning into a princess is terrible.
Because princesses are terrible. No other reason given. LITERALLY NO OTHER REASON GIVEN other than "princesses suck and we hate them." And why do Bronies hate princesses so much? Why is their favorite pony turning into a princess somehow the equivalent of getting a slap to the face?
Because princesses are girly things, and as we all know, girly things are just terrible.
Like I said before, there is literally NO OTHER WAY TO PARSE THIS BACKLASH other than to see it for the astounding misogyny that it truly is.
Over 2500 comments on the Equestria Daily article and not a single one of them gives a reason to hate the princess transformation other than princesses suck and we hate them. Not a single one of the comments gives a reason any deeper than that. Not a single one.
The EW article linked above goes even further in depth covering the backlash against Princess Cadence's appearance in the season 2 finale. And why was there complaining about Princess Cadence? According to Sethisto:
And why, exactly, would a pretty pink alicorn princess be "the exact opposite" of what Bronies want? Sethisto doesn't say, but I'll bet money it's because traits like being pink and being pretty and being a princess are (*gasp*) GIRLY!!!!1! Never mind the fact that Cadence is a fantastic character who was clearly set up as being powerful, important, and central to the story of the season 2 finale well before the episodes aired on television. In fact, I think that's what made the backlash against Cadence all the more vehement: How DARE a new character who's clearly set up to be super-powerful in the MLP fictional universe and super-important to the plot of the show be (*gasp*) pink and pretty and a princess oh noes!!!!
In short, Brony fandom has once again established that it is firmly entrenched in the mindset that all things girly are terrible and gross and wrong. Which is REALLY UNFORTUNATE considering that this is a fandom for a cartoon for girls.
Shortly after EW broke the news of Twilight’s transformation this Tuesday, the fan community exploded into a flurry of commentary — most of it negative. [...] The backlash has been even worse on fan sites like Equestria Daily (where the original post about Twilight’s princessification has drawn over 2,500 comments) and Reddit’s pony-centric message board (where hundreds of fans have expressed fervent hopes that the royal metamorphosis isn’t permanent).
So why, exactly, are bronies getting their bridles in a twist? “It’s just your typical overreaction to something changing in your favorite series,” Equestria Daily founder Sethisto (real name: Shaun Scotellaro) tells EW. There is, however, a little more to this specific outcry: “I think the main thing is that it’s happening to a character so many people connect to. Twilight Sparkle, she’s more of a nerd. She’s like all of us, that geeky nerd who reads books and gets all excited about stupid stuff.” The prospect of the show’s audience surrogate getting all gussied up, then, sort of feels like a slap in the face to MLP‘s grown-up fans.
And that's it.
That's the meat of the entire article.
That's the reason.
So this is what it boils down to: Bronies identify with Twilight because she's nerdy, but princesses are terrible, therefore Twilight turning into a princess is terrible.
Because princesses are terrible. No other reason given. LITERALLY NO OTHER REASON GIVEN other than "princesses suck and we hate them." And why do Bronies hate princesses so much? Why is their favorite pony turning into a princess somehow the equivalent of getting a slap to the face?
Because princesses are girly things, and as we all know, girly things are just terrible.
Like I said before, there is literally NO OTHER WAY TO PARSE THIS BACKLASH other than to see it for the astounding misogyny that it truly is.
Over 2500 comments on the Equestria Daily article and not a single one of them gives a reason to hate the princess transformation other than princesses suck and we hate them. Not a single one of the comments gives a reason any deeper than that. Not a single one.
The EW article linked above goes even further in depth covering the backlash against Princess Cadence's appearance in the season 2 finale. And why was there complaining about Princess Cadence? According to Sethisto:
“Cadance was a pretty pink alicorn princess. That’s, like, the exact opposite of what we wanted.”
And why, exactly, would a pretty pink alicorn princess be "the exact opposite" of what Bronies want? Sethisto doesn't say, but I'll bet money it's because traits like being pink and being pretty and being a princess are (*gasp*) GIRLY!!!!1! Never mind the fact that Cadence is a fantastic character who was clearly set up as being powerful, important, and central to the story of the season 2 finale well before the episodes aired on television. In fact, I think that's what made the backlash against Cadence all the more vehement: How DARE a new character who's clearly set up to be super-powerful in the MLP fictional universe and super-important to the plot of the show be (*gasp*) pink and pretty and a princess oh noes!!!!
In short, Brony fandom has once again established that it is firmly entrenched in the mindset that all things girly are terrible and gross and wrong. Which is REALLY UNFORTUNATE considering that this is a fandom for a cartoon for girls.