Why do some people give negative rating

Tweet

Though i havn't got any negative rating but i wanna ask some people who enjoy giving negative ratings to others, what do they get it from?? if you don't like someones post then just don't reply it...earning from mylot is a very slow process if you give some body bad remark his earning rate will further go down. why can't we stay together in our money making mission.... Raise your voice if you agree.....!!