It's two months since I joined an extracurricular practicum group in Yiddish as part of the requirements by the school where I've been studying Jewish life coaching since last July.
The other five groups the school offers are in English. Though my English must be better and lexically richer than my Yiddish, I feel more comfortable in Yiddish than in English because I've never lived in English, while in Yiddish I conducted a married life, though a short-lived one, using it all the time for every possible topic in daily life (as well as for discussions on linguistic research).
The supervisor of this Yiddish-speaking practicum group is a notable Hasidic rabbi in Brooklyn and a native speaker of Hasidic Yiddish. In more than half of the sessions I have had in the past two months I was the only student. In the other sessions I had another former student, who is also a native speaker of Hasidic Yiddish living in Brooklyn.
So after using Yiddish for decades I suddenly find myself forced to cope with native Hasidic Yiddish for the first time! Now I suddenly realize that I've been using Yiddish mostly with those who have also studied Yiddish formally as I have, including my ex-wife.
What I still find it very difficult to get used to in this native Hasidic Yiddish is its pronunciation of vowels, which is different from that of standard Yiddish based on Lithuanian Yiddish phonetically, which is what is taught in formal settings unless otherwise specified.
Though I have had enough occasions to shmooze with quite a few Chabad emissaries outside Israel, spending whole shabosim with them in Lithuanian Yiddish, this is also the first time to have serious conversations with non-Chabad Hasidim.
What compensates for my difficulty of getting used to their pronunciation of Yiddish is that I can freely use all those concepts of Yiddishkayt, including Talmudic expressions of Aramaic origin that are also used in Modern Hebrew but are not so understood by many of its non-frum speakers, and feel fully understood by these native speakers of Hasidic Yiddish not only conceptually but also emotionally as they also live these concepts.