Hi!
First, rigged chopsticks in paper are consommable ones, so you have to separate them carefully. Then, as they're not lacked or having no varnishes on them, they may have some little bits of sharp wood on it, so you have to rub them together to make this little things go away, eventually.
Then, as they're shortest than the japanese lacked ones (as I use to have at home), it is not the same way to use. But that depends of the person (my wife is more handy with the rigged ones).
Second, to answer the real question: yes I was once embarrassed. Here in Paris we have since two years about full of japanese and sushi bars, it is new, and they are everywhere. Once, I went into one of them and asked for an Asahi and yakitori, in japanese as I did two years of learning this tongue, and the waiter answered me in french, with a kind of chinese accent: here it is a restaurant...
I believe he was chinese or vietnamiese, and so he didn't understand nothing at all and believed that I was asking for anything but food and drink.
Now, I never speak japanese in restaurants which are serving japanese meals
