You don't have to disagree for the sake of disagreeing. The worst thing you can do for yourself in collaborative discussions is give in and nod with the consensus. You cannot control how someone reacts to what you say, and their reaction shouldn't stop you from sharing your beliefs. Think about how much youd regret not sharing your disagreement if the company decides to make a really a decision that could have been avoided by talking it out. Without debate and disagreement, companies, people and society just move slower. It is time for you to do your part to help us speed up and grow.