My brother basically bully’s me

He constantly insulting me whenever he’s home ( he goes to college so he’s not home everyday) telling me I should be sectioned ( I have aspergers so I’m not like most people) and calls me anorexic ( I’m a perfectly healthy weight, right in the middle of what’s recommended for my height and age) he knows what triggers meltdowns and when I’m crying on the floor he’ll keep going till i’ve lost it completely. When he comes home my anxiety is through the roof knowing the stress I’m about to endure. I tried talking to my mom about it but she says it’s just normal brother-sister fighting/ banter and I should stop being dramatic.

I don’t know what to do, none of my friends live near me so I can’t escape for a few hours... It’s not serious enough to report him anywhere but I just wish he’d stop, he seems incapable of knowing what’s to much to say to someone....