Incel Brother/NMom please help/respond

So I just got into an altercation with my brother who is 23 and i’m 21 (F) We were in our mothers room joking and laughing at first about how I don’t have a job (I’m in college and it’s just been really hard for me to get one it’s not like I haven’t been trying, but i doordash) And how i need to get one. I go on to say we’re both in no predicament to bash each other cause we both still live with our mother. Fast forward to my brother saying to my mom… “You guys need to instill some type of ambition in her or she’s going to be one of those girls who does OnlyFans”??????? I’ve never felt so utterly disgusted and disrespected in my LIFE. I don’t give off that impression at all but to say that to your sister? you’re gross. I knew i couldn’t slap him then because my mother defends him with her life and she would’ve let him 1000% beat me up or harm me. So i waited until my dad got home to talk more about it. He showed no remorse and gave a half ass apology so i threw my shoes at him. and I say “But i’d be wrong to smack you right?” And he says “It’s a reason you haven’t” so i smacked him. He tries to pin me to the stairs and grab my arms and legs. My dad pushed him down the stairs and as we’re falling my dad starts to choke him up, my brother did go limp. My mother is defending him saying he didn’t mean to say what he said in that context and I was wrong for hitting him and My brother didn’t do anything THAT wrong to provoke that basically. Im happy my dad defended me but I’m so torn because i can’t believe as a woman you wouldn’t defend me in that situation. I’ve never had a mother figure and It’s so hard for me to move out financially and get on my feet because i’m in college and been having a hard time getting a job. I don’t know what to do.