Might just be a matter of doing some self-introspection going and understanding why exactly are you getting negative reactions over failed expectations. I think the problem lies in yourself, not the community.
When the future, and the expected feedback you would like to receive take more prominence than the art itself, it might be a good time to consider why in blazes are you even spending the time in it.
Go turn it the other way around, I suggest. Have the art itself take the mayor role. If you do this, then things like persistence and perseverance will come to you naturally, since it's a shift in focus. I myself spent years, ever since 2006 or so, posting shitty art and being ignored; but it never was a negative experience since I didn't concern myself over expectations. On the polar opposite, I was thankful for any tidbit of time people invested in me, and my own motivation regardless of circumstances took me through.
If you are incapable of changing yourself to value more the art itself over the attention it can get you, then you could at least change yourself to be thankful for the critique you get every now and then. Notice how everything has to do with yourself.
The difference between being thankful and having expectations can be reduced to lines of code. Imagine you're this robot, and some external stimuli is perceived by your senses:
[Acquired: Critique]
You can either:
[Reaction: Positive, thankful, critique gained. It's a gain.]
[Reaction: Negative, not what was -expected-, for whatever reason.]
The reason having expectations in this world, in all fields, is so seemingly a pointless and nonsensical idea, is because it's literally -never- under control, and never will be. Especially considering the nature of sites like these, where everyone is free to do what he or she wants, based on whatever the hell they want at any particular time.
So yeah. Know thyself, take action upon it if you wish, or whine. Whatever you find most exciting.
