When they expect you to fold, raise your standards instead of your voice.

People expecting you to collapse are usually watching for noise, because noise is what collapse sounds like. Shouting confirms their read. Quietly requiring more, of the work and of how you are treated, does the opposite, and it is much harder to argue with because there is nothing to react to. Standards are a position, not a performance.

When someone is waiting for you to break, pick one thing to do better rather than one thing to say. Turn in something noticeably stronger, be exactly on time, answer briefly and well. Let the change in level be the whole response.