You are not alone with this type of thing. It is rare but it happens. Many years ago back in 2008, we had a rental client. He was a gay male. He picked up a guy he met at Museum and the same thing happened to him. He was renting an apartment from my company. The guy was very drunk and admitted that to us. We aren't sure if he was drugged but he said he drank quite a bit.
The apartment he was renting didn't allow you to leave the building without having a key to the lobby door. So the worst thing is he not only got robbed but he had to call our office to have someone bring over a key so he could leave the building. The guy he was with stole all his cash, his laptop, his cellphone and some other things.
The worst thing is a few days later he went out to another bar/club and the same thing happened to him. At least you learned your lesson
@HannibalLector and I'm sure it never happened again. This guy that rented from us it happened twice in a week! Needless to say we didn't feel sorry for him the 2nd time.