Why do we live in a world of haters?

Im talkin about when you get something, they say, "well I woulda got this, or you coulda got it for cheaper." How about when you type a damn random question that your just bored and interested in what other people think, NOT just a damn definition, and they wanna talk down to you like your computer illiterate and dont know how to look things up for yourself. Bottom line, if youve answered the question before, dont answer it again if you dont have anything good to say.