Nom, you’re not providing sources for anything, just claims about things you’ve seen in books, without describing what the scenes were, or where they were. As for ruchoma shain, she did not grow up in a frum community; her father was a trailblazer, and in her public school, she was basically the only frum girl in class…so it makes a lot of sense that her friends would do what goyim and frei people do.
Just repeating that something was historically common in an anonymous forum where no one is believed by authority is very unconvincing.
As for it being a problem by chasidim…you say you’ve seen “posts” about it – don’t be a pesi maamin lechol davar, especially with what you see online.
Also, it’s only being protested in the elements of MO that are influenced by the yeshivos. A large amount of young israel rabbis learned in eretz yisroel in charedi yeshivos. They started saying that bungalo colonies can’t keep calling themselves young israel by virtue of their mixed pools and dances, because YI didn’t want to be associated with such things anymore.
The growing leftist wings of MO are getting worse in these inyonim