How would you react to a teenager who thinks you can't look after yourself?

I can look after myself. This is what has pissed me off. I run my own business, I cook and look after my whole family and clean up after their damn crap they leave everywhere. I am absolutely fuming. I told him he took the banter too far and such but I literally just don't know how to handle this. Especially as this has come from my own younger brother. I mean his other sister isn't in much better shape either. Pregnant. Possibly going to end up single. Because of her stupidity in lying about being on contraception. Now I definitely dont feel a need to hang around tbh. I mean what's the point when everyone thinks I'm a waste of space.