Well I don't...
We all have our opinions on different subjects. What becomes quite the hassle is when others make it apparent to make you feel like a fool by telling you well that's your opinion. 
Now of course everyone has their own opinion and it is not anyone elses obligation to have to follow it, but what bothers me is when it turns into a battle of opinions.
I don't mind that you have your own opinion but don't make it seem like my opinion is worse than yours. That's where arguments are sprung from. The fact that one thinks their opinion is more valid than the others. For reasons that are unclear to me to be honest.
We all have our own opinions and that's completely fine, that's great actually...that is truly what makes each and every person so awesome and different. But seriously save your breath and quit making it seem as if your opinion is any more valid than the next. They are opinions, ways you view things, your peception and interpretation of how things are or should be. Do not make it a point to make sure that everyone should think like you do. If you are going to make an opinion, well damnit...put it in a sense that can be more so a consideration...not a you're right / you're wrong for a certain opinion.
That's all I really have to say about that. It just bugs me when people come up with their opinions and expect everyone else to abide by them. Just relax and know you can't change everyone, it's up to themselves...just throw the idea out there...nothing more, nothing less.