First time posting so if I'm doing something wrong, let me know and I'll fix it. A bit of history to give context: 1. I'm a 19yo F moderate, living in the PNW in an extremely liberal town 2. My father is an Alabama native who was extremely intense about me being respectful to everyone, especially people in a service profession 3. Regardless of my personal beliefs about the transgender movement, I never want to make someone uncomfortable and, in a conversation, tend to use preferred pronouns/name. 
On with the story: I get coffee a lot. Like a LOT. And a local coffee shop in my town has a transgender woman who typically works the drive-thru window. We've spoken multiple times and are on good terms. Everything is good. However, a few days ago, I was really scattered after work and completely forgot they might be working the drive thru. They have a really masculine voice and don't try to make it higher or anything, so when I ordered, I figured it was a cis man. All good, they took my order and at the end I said, "That's it, thank you, sir!" I usually say "man", "dude", or just nothing at all when I know it's this person working the drive-thru, but this time I just wasn't thinking about it. When I got to the window, I immediately felt kinda bad, but didn't want to point it out in fear of literally being yelled at (it's happened before with other transgender people, multiple times), and I heard them say to a coworker that they were mad about it. I got my drink and everything was fine, but they wouldn't look me in the eye and held the cup and took the cash from my hand in SUCH an awkward way, just to avoid the potential of brushing hands with me in passing it to me. This hit me hard (ridiculous, I know) because I was raised that making contact when exchanging money or goods is a sign of good faith, trust, and respect. I usually don't care because a lot of people don't think that way, but especially right after I accidentally hurt them and they usually don't do that, it sucked. It's probably ridiculous to turn to the interwebs for confirmation, but against my better judgment, I feel like an absolute dick about it. AITA?
TLDR: went to my regular coffee shop and misgendered the drive-thru worker I've spoken with multiple times, then they wouldn't look at me or talk to me at all. AITA?