They didn't act like a bully or stand up to one, their statement was akin to asking Pence to be nice. Which might be a waste of time; as a Bible-thumper, he's pretty certain that he's already a nice person and the limiting of gay rights and promotion of the Christian religion at the expense of everything else are among the nicest things he can accomplish for all of us sinners.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould