An opinion is wrong, when its not based on any facts. If you believe the election was stolen, you are wrong, because there are no facts to support such an opinion. Trump saying it happened and you believing it, doesn't validate your opinion, it just proves your gullibility.
People hold lots of "opinions", but opinions are like assholes, everyone has one. Everyone is entitled to their own opinion, but you're not entitled to your own set of facts. If you don't like the outcome of an election, you can't just fabricate a different outcome out of thin air, and then pretend that its real. That's called "delusion".