Someone tried this in my comments a couple days ago. Insofar as he (cis) has opinions about limiting trans people's rights, he'll insist he just has normal disagreement and it's his freedom of expression and conscience to speak up. By contrast, when trans people have opinions about what we stand to lose or suffer were he to succeed in taking away our rights, he'll insist we're making "demands" that infringe upon his freedom, and worse, we're "vocal"—a special breed of trans person, all of whose opinions will be illegitimate simply because they come from a person who is "vocal," i.e., everything we say is wrong because we are voicing it.