Family doesn't want to talk about the controversial stuff

I'm a pretty passionate person when it comes to issues like gender and racial equality. However, my parents and my little brother don't seem to care much. So when I try to educate them, or talk about a controversial topic, my brother says he doesn't care, and my parents choose to shush me so that we can just have a chill time together. This has happened many times, and I've tried talking to them about it. But tonight, they did it again, and I just walked off. I just don't know what to do? I've really talked to them about it before, how I was upset when they did that, and how I want to have these conversations with them. I've said this all calmly both in the moment and afterwards. But they're still not being open to talking about the big issues. I know our views differ on some things. But to not even talk about it is upsetting.