Oh, I'm well aware of that. But even in this case, there are many relavant details left out that make it impossible to really answer the OP's question, details that one would have access to if they were in the situation themselves. For instance, some people here are assuming that the Deaf individuals were given no opportunity to respond, or that they were being intimidated in some way when that may not be the case. Even the OP saying that the "Hearing people are in power positions" and that they "are very very proud of the fact that they know sign" is evaluative rather than factual giving us less information to work with than one might realize. For instance why does the OP assume they're in power positions, and why does she assume they're "very very proud" of their signing ability? What behavior is she observing that's leading her to those conclusions? Same with her evaluation that "They are not accepting my information". Again, what behavior is she observing?
And now that I take a closer look at this, I think the whole problem with the OP's question is that it is highly evaluative, so we're trying to provide advice based on her biases rather than facts. Granted, the ability to observe rather than evaluate is a learned skill, but it's an important one.
Yes, that's the point. It also gives you a framework to start from when you face a similar situation in the future as well as gives you the tools to analyze your choices after the fact as a way to self-check yourself.