I learned that Yiddish was spoken to stay separate from the goyim. I guess it would apply today too. “
Hebrew does that, too. Yiddish didn’t separate us from the goyim. It helped Jews all over Europe communicate with each other. Hebrew could have accomplished that, too, long before the Satmar Rebbie said a word about it. The people who spoke (and speak Yiddish) were holy, but the language was nonetheless based on a potpourri of goyishe language mixed with some Loshon Kodesh.