That's their goal.
It doesn't matter to them if you're good, bad or just trying out with your work: they actually find satisfaction in mocking other people (and most time it is just for envy) and their so-called feedbacks, when it isn't completely useless (like just "bad", "oh, god", etc.), it doesn't lead you to improvement but just to an attempt to discourage you more and more.
They feel great that way, just consider them as they consider you or your work: zero.
F-777
Take it from someone whos been posting music since 2007 XD.
This is the awful truth of the internet. Horrible people out their down voting
JUST so their own submissions end up higher on the chart.
Ratings mean nothing. Don't let them bum you out ;).