This phrase has become the go-to phrase for anybody who gets disagreed with. Of course, everyone is entitled to their opinion, but we’re not entitled to our own facts*.
So for example, Britain is considering reneging on a deal that was signed with the EU about Northern Ireland. That’s reality. Some will say that’s because Britain is no longer a trustworthy international partner, and we’re led by an unscrupulous populist who’ll do anything for power, some will say that the EU have annexed a part of our country and deserve everything they get.
COVID cases are rising in the UK. That’s reality. Some will say that’s because all those idiots won’t get vaccinated, others will say it was probably inevitable in the circumstances.
Are we entitled to our opinion even if it denies reality?
( the own facts quite is all over the internet, I’m not sure who originally said it )