There is absolutely no reason why someone couldn’t do that in a regular social situation. You’re making things up to justify your position. I’ve pursued both men and women in a nightclub or other social setting. My former band-nerd husband learned how to do it.
I’ve quoted to you that experts believe that non-verbal cues account for about more than 50% of communication, so saying it’s impossible to learn to read that is just absurd. Women do tend to be better at reading body language, but that’s in part because men have been socialized that they don’t need to.