I generally don't bother trying to correct people in real life unless it's something extremely trivial and provable with minimal effort (like who sang a certain song or something), or something pertaining to work (as in, if I don't correct it, it's going to fuck up a lot of stuff, and I make that understood, as well as the consequences of fucking it up). And if the former, it has to be done with tact or they're going to think you're an asshole. You can't just be like "No, that was X", you have to be like "Oh, I always thought that was Y..." and then let them look it up if they care to.

Generally, outside of a work environment where authority and knowledge is expected, people tend to either disagree and do what they want, or agree with you... and then do what they want, or continue to believe what they want.

You can have a doctorate in the field with your thesis being the debated point, and people have been 100% conditioned to latch onto whatever stance they read about in print first. Like, a random article about a lady eating eggs, bacon, and a few shots of whiskey for breakfast every morning and living to 100 will have someone dead set on those things not killing them, even if the one telling them that's stupid is a registered dietician trying to help them manage their diabetes.