The thing is that most people are ignorant about such matters whether they realize it or not. And while this is a huge part of the problem, you can't fault someone for lack of awareness or knowledge. What you can try to do is appeal to their empathy by explaining how said actions are both harmful and hurtful. You can then take action to correct any perceived inaccuracies or even go so far as to enlighten them with additional info you deem pertinent to the subject in question.
Just make sure you yourself have a firm understanding of whatever it is you're hoping to inform or educate them about, and don't be too aggressive in your approach. In a lot of cases, you'll be met with resistance (defensive or deliberately obtuse behavior) because very few people like being told that they're wrong. But don't let that discourage you. Press on regardless if you're up for the task. Changing hearts and minds in one fell swoop is never easy. But you can at least take solace in knowing that you've removed an element of unknowing from the equation.
As a reasonably decent human being, once you know better; or at the very least, that you're making someone feel like **** with your invective and your misinformed assumptions, you'll want to do something about it. You'll make an effort to introspect. But when this doesn't happen, and people still continue to double-down, that's when you know that their issues go way deeper than ignorance.
