"I was so embarrassed that I didn't recognize the person."
You shouldn't be embarrassed. Maybe his hair was a different color and I assume he/she/they wasn't wearing makeup the first time you met. I have met co-workers on the street who didn't recognize me because I wasn't wearing my uniform.
"We discussed several things about being trans (besides movies, crazy stuff in La La Land) and I'll admit, I mixed up pronouns several times. They didn't care because I viewed them as a person."
Well, you were kind enough to buy him/her/they/ dinner.
"How many of the people who call others out for using the wrong pronoun would even stop to talk to a trans/gender fluid person? They just want to virtue signal."
Thats true, but if they don't call out others, people might confuse them as Voldemort's and they could lose their friends and maybe even their job.
"As to Ezra Miller, I hope he gets the help he needs, and that has nothing to do with being gender fluid. It's the anger issues that are having violent manifestations"
Whew! That was a close one. I am glad you clarified that.