Even with a trans person does something shitty, such as Blair White, Caitlyn Jenner or Ezra Miller, it's not a free pass to misgender them. The only effect of that is the trans people in your life know you aren't the ally you claim to be. You aren't misgendering your friends because you are polite. It's absolutely not okay, keep criticizing crappy trans folk, but when you intentionally misgender then you attack all of us.