Opinions are important, having them is a part of what makes you unique. If we all shared the same view then the World would be painfully dull. But there’s an important rule when you express your opinion and that rule is very simple. Don’t be an arse about it. I’d say that’s a pretty easy rule to follow right?
Alas, people seem to forget that their opinion is not law, just because they have an opinion doesn’t mean they’re right and that goes for everybody. When expressing an opinion, it’s important to know when the line has been reached and when it’s been crossed.