If I lived in a majority-Cholita area, I would not give it a second thought. If I lived in an area with not many Cholitas, I would wonder if there was a reason the group had only Cholitas.
Really? I live in Japan but am not Japanese. I speak Japanese and have many Japanese friends. I’d feel quite different about joining a hiking group that was 100% Japanese as opposed to one that had a mix of Japanese and non-Japanese people.