Saying “it’s my opinion” is meaningless. It adds nothing to a conversation. It isn’t an argument, it isn’t a justification. It isn’t even a grunt of acknowledgement that the other person has said something. It’s less than all of those. What “it’s my opinion” says is this: I can’t be bothered coming up with a reason why I think the way that I do. In addition, I can’t be bothered listening to a word you’re saying to me. If you’ve put effort into communicating with me, you really needn’t have bothered. I have this thing called an ‘opinion’. I’m too lazy to have it challenged or contemplate the possibility that it isn’t correct.
Source: considertheteacosy.wordpress.com