I recently tried to get a 0.1 litecoin loan and it got rejected, which I was ok with, but few minutes later some guy gives me negative rating.

You should have read my warning. 
I tagged hundreds of users like you before I realize I'm just harassing people taking advantage of the lawlessness here. Luckily, others like
condoras have taken my place. If you are interested in getting your trust back, try educating some users in the newbie section about scams and fraud. Time won't heal that wound without help.