You are Absolutely NOT alone. Joanne's can be a nightmare. For one thing corporate is so cheep, even on big sales they never have enough help and what they have is usually poorly trained. I speak from experience as years ago I worked there. As soon as someone was well trained they offered a tiny raise. Mine was 13cents. I quit! I was teaching classes for them, and that raise really said just how much they appreciated their help.
We have two stores about the same distance away one north, one south. I will go north. But never again south, I leave just like you, shaking and disgusted.