I've been wrong about things but typically its due to the information available at the time and that changing. And I've admitted I used to be much more flippant and edgelordy 13 year old boy spouting awful shit (that even at the time I didn't actually believe/support although I also never had to confront that so its entirely possible I could've ended up being a dipshit that partook in others actually being that way, thankfully I was spared and matured) far later in age than I should and that I'd go back and kick my own ass if I could. And some was simple ignorance, but I've posted about that stuff as have others, and I think that is more in the spirit of the OP.
Which specifically with regards to politics, I didn't say much in general so I didn't typically have the opportunity to be wrong, and the limited times I did it was to tell raging right wing dumbfucks like...rudeguy(?) to stop being complete morons, which was the right thing, because they were. Also I didn't post in this subforum because, and this is still true, I fucking hate politics (not government, but the dumbass idiotic bullshit "politics" that we know it as, which is talking head media people and politicians trying to be celebrities, spouting blather 24/7). The problem is, I was a typical modern American that had duped myself into believing that made me some apolitical arbiter of objectivity, and that "both sides were equally extreme and neither was right" when in fact it just blinded me to how fucking insane right wing politics has been, basically for the entirety of American history (with a few key instances of it being particularly insane).
That's not to say there weren't plenty of legit issues with Democrats, but they've also recognized that stuff and changed. Not always and not nearly as much as they need to. But I also understand there's a majority of "centrist/moderate" in the US, but those are the old willfully ignorant people like I was, but sadly they have such outsized say in things and are prone to buying in to the simple and easy lies of right wingers so even right of center "liberals" have to try and appease them to keep them from enabling the worst of the Republican policies. So there's give and take. I work on the specifics at the personal level, whilst being pragmatic when it comes to Democrats having to play this extra bullshit layer of politics. Which women and minority groups are well experienced at because its the bullshit they've had to put up with their entire lives.
One thing that didn't change and won't change is me being an asshole about politics or social issues (even specific social situations), because that's actually turned out to be much more fruitful in getting people to consider their viewpoints. I tried honey, it didn't work, so I'm just gonna straight up piss in your face. That doesn't mean I'm absolutely right by any means, but I do it to try and knock people out of the stupor they get stuck in. Especially with a lot of the shitty racist/sexist/bigoted crap I still see people on here post in the most asinine ways. And that probably goes triple for groups that are unfairly discriminated against, because if I as an average but still ridiculously privileged straight white dude can take some of the heat for them and also get to spit a bit of the fire I know they wish they could back at these assholes, then I'm there. Call me pejoratives, get mad that I'm "too woke", etc, it'll still leave a lasting impression that will make you think about it later. And I've had multiple people tell me that ultimately is what led them to actually actively think about things and ended up leading them to learn and grow and change.
Also I have nothing but disdain for people that have had ample opportunity to see the error of their ways and choose not to change but want people to treat them "nice". Nah, you don't get to be an asshole, pushing horrible policies, but then expect people to treat you like actual decent people. I have zero qualms about being an asshole about that. That's not to say I don't think people are irredeemable but they have to actually change.
A specific instance where I was wrong just came to mind. I kept trashing a certain poster for their shitty opinions in one of the COVID threads, but I'd gotten them confused with a different user, but I only half apologized because awful opinions by the person I was incorrectly trashing made me realize they weren't the same person, but they were still an asshole with shitty opinions so I was only sorry for getting them confused, not for trashing either one for their shitty opinions.