On my first trip to Thailand 30+ years ago, there were lady boys, but they didn't cover the streets and there were only a few bars around with them. They were also a bit more obvious as the surgery then wasn't as advanced at making them look as feminine as it is now. So it wasn't such a big thing.
Looking back to my first trip, I was warned about them when I arrived, but didn't know much about them, what to lookout for, or about the differences, pre-op, post-op, etc.
One night I had gone home with a very sexy girl from a disco. I was a bit hammered and I think she was too. About halfway through, while I was partially hanging out of her, I stopped and asked if she was a ladyboy. All those warnings had suddenly overcome me in the heat of the moment. Well, that didn't go well. She was offended and out the door in about 10 minutes and I was left there for dry mid-stroke. Well, I guess she wasn't. 😂