How to deal with issue with my brother and race ?

I come from a black family. 3 brothers and an older sister. So my brother born right after me is 20 and I thought by now he would be a bit smarter but I guess not. I was in the room with my sister and youngest brother and we they were talking about the protest. And that is when he come in says blurts our “fck black lives matter!” My sister was in complete shock, saying are you serious? He laughs and says it was a joke. I told him he really needs to grow up. We are all black males, this is not anything to joke about, he gets angry and says we are all ganging up on him. And then asking us why do we care about some random black dude anyway. I told him I don’t give a fck about any of that right now, I told him he needs to shut up before he regret it. He gets angry and says “who is going to to make me shut up!?” So I got up with my fist ready to fight. My sister grabs me and says he’s not worth it. But now I’m not not angry, I just want call him and talk to him but idk if he would listen he’s probably still mad.