With respect to social dancing, I'm a little bit disappointed. I already went a year ago and thought with a better understanding of places and culture, I would enjoy more. But there seems to be actually less Salsa dancing than in my city Munich and connection when dancing is poor. People here have significantlly less eye contact when dancing and some girls really avoid it. That may be less important for Salsa and Bachata but in Casino or even Rumba, eye contact is essential. When looking for the next girl to dance with, my main criteria here is how much she looks at her dance partners. And except for the professional (Venezuelan) dancers, most people have a weired perception of dancing in Europe. Most people have no idea about parties and festivals in Europe and think that outside Peru/Latin America people cannot dance. And it happens from time to time that girls refuses to dance with me, sth. I'm not used to from Europe. I don't know if this is due to shyness or whatever.
I am surprised that you are surprised. I never been to S. America yet. I would be very surprised if your experience was any different than above.
It is not uncommon for Latinas and girls to turn down a dance invitation. You are living in a very different world if you think men don’t get said no.
May be you have unrealistic expectations. In S.America tothere is a distinct scene of the dancers who are trained and average people of the culture that like dancing.
With respect to dance level, it's difficult to compare because in Europe I either dance at home, where I know the good dancers, or at festivals, where the level is obviously higher than at normal parties. But while in Europe the dance level of girls tends to be higher than the level of guys, here the guys dance significantly better than the girls.
There are good EU leaders but as a percentage of total leaders or dancers, it is a lot small compared to anywhere else - Asia, N. America, S. America. Closest scene to me which is least European in this regard is Paris. I think there are more high level leaders in the Paris scene than equivalent followers.