Joseph: if you’re Rebbe told you that Yiddish is holy, then so be it – for you, it is holy. As I’ve said, my father-in-law, a respected gadol in his own right, told me straight out that it isn’t holy at all. He speaks Hebrew and English in his daily conversation (depending on who he’s speaking to), and doesn’t worry that Hebrew shouldn’t be used for idle conversation.
I guess we just have a machlokes as to the holiness of Yiddish. You follow your Rav, I’ll follow mine. As to your view on Hebrew, I wonder, do you have a mekor for your opinion that it shouldn’t be used for everyday speech?