My younger brother keeps saying he is an Alpha male and bad mouths who he thinks are Beta. Can some one please explain to me what the hell is going on?

I say this as a younger brother who was beat up by older siblings. If you are both under 18 and he's a lot smaller than you, slap him. If he thinks he's an "alpha" and you aren't, it might be the only thing that points out that he is just human

After you do this, please please please try to point out his error in thinking. No "alpha" commands any respect and the "alpha" bosses are the ones nobody wants to work for