I'm way, way below Victoria Strauss's level of success and expertise, but yes, I've had people be that ungracious, hostile, and demanding when I wasn't so mesmerized by their work that I dropped my real life to read on, or when the critique they asked for was actually critical rather than pure praise.
Often such authors are young, and always they're immature. They don't have the confidence in their work (justifiably, in every case) and lash out at anybody who doesn't love it like Mom did. Most often they're fishing for compliments and feel their work should come before my own, or any other demands I may have on my time, like a life.
I had one of these just yesterday, someone whose work I'd been critiquing, gently and cheerily, one page at a time. I called him on not applying what I'd taught him in previous critiques, noting several specifics. He blocked me, reported abuse on my post which got me an (automated) violation notice from the site, and generally behaved like an ass. It's not a lot of comfort to know that he'll probably never even finish his first draft, he's so in need of praise, and that even if he does, he'll never interest a publisher. I don't think I'll be critiquing at that site for some time.
Maryn, weary of teenagers' reactions, even though she really likes teenagers