I never really had much problems with my direct family, because they're socdems at worst, or soft socialists at best. But the more you rub it in their faces that capitalism will kill us all, the more you expose it for what it is, regardless of how you do it, the more "left-wing" kind of guys will just let go of it all and go all into radical politics. To normalize some positions, there are two things you can do : whenever the news allow it, and they might be receptive to what you have to say, drop some of that agitprop; and when you do so, go full mask off if you're good at defending your positions. Note, this isn't for libs/chuds/fascists, but for reformist/moderate leftists.

If you wish to talk to the latter group, you'll need to understand who they are, what their class interests are, and how capitalism screws them. An overworked manager will not have the same problems as a nurse, a teacher or a steel worker. If that person has terrible economic views, but shows promising positions on the environment or social policies, then attack from this angle. I may need to mention something to you, dear reader, if the person you're talking to is someone whose interests align with the bourgeoisie, unless that person shows signs of deep alienation, arguing with that person will be next to impossible. The same can be said to religious fanatics, and full-on nazis, just don't even bother, no matter their level of alienation, they will only listen to you if they know something feels wrong.