It's quite simple, you take a clear eyed look at the problems in the world and you say, "I don't need to accept this, this can and should be fixed." You'll no doubt encounter people saying silly stuff like you cited, because some people operate on the basis of "the most cynical take is the correct one;" you ignore these people and continue to focus on the problems at hand. Similar to how, if you want to start a business, there are likely people in your life who will shoot down every idea that you have; you stop asking those people for advice.
One challenge with that approach is if you're not careful, someone might start identifying you as a threat because of that behavior, and start attacking you using the BS and lies that a great many others are susceptible too (or outright violence).
What we're seeing now is the part of the larger cycle where folks get more and more insistent that they're warped world view is correct (and it wouldn't surprise me if we get more violence than we got on Jan 6th later because of it), since they can't acknowledge that they're wrong and something bad is happening because of it, which will cause more bad things to happen.
It is imperative more people stand up and provide counter-pressure, because otherwise they will win.
