Trans people, I love and support you.
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Errrrrbody else: Say out loud that you support trans rights. Work it into conversation. People will hear you. Some of them may be trans and hearing you will help them. Some people may start to question their prejudices, or at least realize that they are prejudiced. For some people this may be the first time they've ever thought about it. And you might encourage other people to be kinder and more open. Whoever you talk to, these are all people who vote, are on juries, teach children, interact with the public, provide care, do business. You DO make a difference when you speak up.
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And keep calling senators, reps, and the White House. For the sake of a trans person who might see the record of millions of calls made and feel less alone.