Second important fact: critique by your peers is definitely different than a final product presented to your audience. People can't often distinguish between QUALITY and TASTE. For example, I can like a movie (book, song, whatever) that is not technically very good. I can also DISLIKE something that I recognize is.
As with anything else, there are circumstances and reasons for an artists anger towards critique or review. Sometimes it's because the critique is demeaning and nasty (triggerstreet) Sometimes the reviewer doesn't make their point clear enough and the artist is confused. Sometimes people just want praise when it isn't earned.
I hate RUSH (seen them a bunch of times), and anyone who says they love them, I'll tell them how much I hate them. But, I will acknowledge they're excellent musicians. I just don't like their music.
Opinions should be taken with a grain of salt unless you completely agree with what the person is saying. Then you change for the better.
Personally, I appreciate when people tear my work apart, but specifically when they can point out specific things that were done well or not ("it sucks" is just as useless as "it was good", or the bane of every musician ever "...that was interesting..."). If they like it, good, nice to hear, I'm proud of what I do. If they don't, well, no one likes everything. If they can identify why they did or didn't, that can help me improve what I do. Again, I'd like to be doing this sort of thing professionally, so any chance I get to improve, I can.
So rarely do you get those critiques.
I know I'm opinionated, but I have a friend that when he talks I listen. He's always right. Unfortunately he's a musician and not a film maker. So, I know my mind can be changed. But, seldom do I get the feedback I'm looking for. I get thoughts and some ideas. But, I don't get that "Damn, you're right" moments.
As for someone who is not a filmmaker (or part of whatever creative field you are in) not being able to offer critique, I disagree with that.
You can get opinions, critiques and reviews from anyone. But, if they're going to spout off about things they don't know about, they usually come out sounding like assholes. Then you don't listen to anything they have to say.
Here's a few blurbs that I've taken offense to.
"The first ten minutes of Us Sinners contains two blowjobs (both of which are ineptly staged)"
"Unfortunately for us, like most low-budget productions, we are denied access to the actual crime, as most of the action takes place off camera"
https://www.youtube.com/watch?v=pWBCo_QRVsE
You can hate everything about this clip. The camera angles/the darkness/music/acting/everything. But, are those two blurbs true? No. Her face was hitting his crotch. If his dick was out, it'd have been in her mouth. That murder took place on screen. Every murder with the exception of one took place on screen.
Critiques/Reviewers whatever. If you open your mouth or write something it has to be based in FACT. It seldom is. That's why artists get upset.