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:
Misogynistic influencers are trending right now. Defusing their message is a complex task
De-radicalising incels out of the ‘manosphere’ through Reddit
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.
How old is your brother? If he is an early teenager, it is possible that he picked these concepts up from somewhere and will very likely grow out of that thinking all by himself.
Twenty Two. He just started this shit. Me and my mom don’t know to be offened worried or what.