Don’t be too angry with yourself at not being able to come up with the right thing to say. Nursing tends to be a very pro-LGBT, pro-choice environment. People on the left are sneaky. When they inject their biases into your education, they do so in a way that’s hard to combat.
However, you could learn a few slogans which might help. For instance, next time, you might say, “Feeling biased today?” You might have said, “Opinions are like bellybuttons. Everybody has one, but you don’t need to show it off.”
Ultimately, the look on your face may have convinced some of the others about your concern. Also, in order to really change these organizations, you need tactics. You might go above her head and complain.
But your power as a student is very limited. The fact that you will have to be trained how to assist at an abortion, whether you like it or not, is one example. Conscience rights for health care workers are systematically being curtailed.
So, in a word, you couldn’t have done much that day. But if you’re dedicated to the cause, you can make it your life’s work to be a nurse and fight for religious freedom, freedom of speech, and freedom of conscience in your field.