I would have to agree with rabbitsfizz.
I do critiques, though I run a disclaimer that I am a: working with photos, which is imperfect and limiting in itself, and b: an amateur and prone to making mistakes/misunderstanding!
I usually do compliment the horse, as I can find good in just about every horse, and for whatever I don't like about them, I have yet to find a horse that I LOVE EVERY FEATURE OF!
My own herd is full of flaws and shortcomings which I have personally posted about and critiqued, myself. That does not mean I don't see their potential, but I also realize their limitations and hopefully, in recognizing the actual faults as in things that could cause unsoundness vs. the aesthetics (such as head shape), I will make better breeding choices.
I never critique in a mean spirit. I am only saying what I see and hoping others can either see that also and understand, or perhaps see it and realize that I am mistaken. I fully admit my fallability and I am also learning!
I think it's important for those who ask for critiques to please remember the difference between serious faults (as in causes of unsoundness, for example bad cowhocks or buck knees) vs. aesthetics (heavy bone vs. light bone, head shape, etc.).
If someone comes on asking for advice, and to not give it is just as bad as someone asking and getting upset about the advice given. You have to realize it is an opinion, and one you asked for. I don't critique horses when I'm not asked, and when I ask, I don't get upset, I do more research and learn about why things were put the way they were, and what might be in error, or maybe I've been "barn blind" and missed it, myself.
We go over this a lot, but again, try to post the best photos you can of your horse. If you have photos that show things you'd rather not have critiqued (such as a pose where your horse has his legs splayed making him look cowhocked when in fact he is not, etc.), don't use them, or just understand that that is what we will see and put in the critique. No need to get upset about it since you yourself know the truth, and can add it to the description. Usually when I do a post for a critique, as in one of my own, I will critique my own, first, and let others see if they agree w/me, or explain why I see what I do, etc.
You say you get angry when someone says something about your horse, and yet you recently posted one for critique, admittedly, with a reason why the said criticism might be true, but no reason to get upset, again, you know it's not true and you also asked for the critique w/the understanding that you wanted it.
Best wishes,
Liz M.