People seem to have a hard time distinguishing the two.
Like if i say i think a game is shit, people will begin to bombard you, asking for proof. Why would you need to back up an opinion with facts. If you subjectivity don't think something is good, then its already an objective fact that you don't like it. Why would someone need to prove that they don't like something.
But i guess sometimes people tend to state subjective view points in an objective way. But even after people state that its there opinion people still continue to want proof. Which again, i don't understand why someone would need to prove that they don't like something.