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?

Your brother is on a (specifically designed and heavily funded) pipeline to being a total piece of shit (not just with misogyny, but racism, and probably queerphobia and ableism too), do what you can to get him off it. A quick search brings up what looks to be some good info to start you off:

Manosphere

Misogynistic influencers are trending right now. Defusing their message is a complex task

De-radicalising incels out of the ‘manosphere’ through Reddit

Making a Radical Misogynist: How Online Social Engagement with the Manosphere Influences Traits of Radicalization

Swallowing and spitting out the red pill: young men, vulnerability, and radicalization pathways in the manosphere

Exiting the Manosphere

There are also many youtube videos on the subject, though I haven't watched any recently, so I won't link, but look up something along the lines of "manosphere right wing pipeline" and you should see some results.