I would bring up the fact that your brother, their son is turning into a person whom other adults would not tolerate, the way he fails to manage his outbursts. Tell them you dont like talking back to them, but they need to step up and actually parent him in those situations, so you dont have to. What they chose to do or not to do with him when you are not around is not your buisness. But in any space, with other people where he is allowed to take up all the room with his emotions, they are essentially letting him down.

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If you dont want to have this conversation with your parents, maybe ask them to look at the comments in this thread.

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Btw, you are 18 and probably going to move out soon. For what its worth, I hope you can make that happen sooner, rather than later. Your parents sound like they have done a poor job with regards to your brother, and as he gets older things could be pretty crappy for you in that house.