Normalize being straightforward and direct with people, it saves time and confusion. Explaining basic manners, consideration, and morals is honestly not your responsibility. Because if common sense has to be taught, it was never that common to begin with. The sooner you figure out who deserves your time and who doesn't, the easier life gets. People will either step up or quietly remove themselves, both outcomes work for you. And yes, you might end up being alone for a while, but that's not a bad thing. It's still better than constantly teaching someone how to behave lıke a decent human. Maybe they are the way they are for a reason, ust not a reason you need to investigate. They'll find their purpose eventually, you focus on finding yours. But don't make them your purpose, go do something better, like counting words in a dictionary just for the thrill of completion.