Example: "Greggs sausage rolls are disgusting" = (your view, I disagree with it but we are just different.
"Greggs sausage rolls should be taxed at 200% because they are so unhealthy"- I disagree with you and may try to change your mind but fully accept that yours is a legitimate position
"Greggs sausage rolls contain traces of sperm" - This is matter of fact not opinion and I think I am right to point out that this is very likely wrong
Its the same in politics, when poster A says incomes will be higher after Brexit and poster B says they will be significantly lower, because the evidence is overwhelming in support of poster B, poster B is right to bang on and on in support of her view. It is not a simple difference of opinion it is a difference of fact