It’s especially concerning when it extends to global/political issues (this is why I said this might be controversial). Reading a quick Wikipedia summary and/or article can go a long way
One of my favorite examples of people getting things embarrassingly wrong is the “Taiwan is not part of China” crowd. Both sides historically disagree with this. Taiwan being a part of China is not some point that has been in dispute until very recently.
The disagreement has historically been over which is the “rightful government”. Sure sentiments in Taiwan have been changing but even this year there was a former Taiwanese president saying this explicitly