They're easy enough to use for me.
The only time I'm probably overly rude with them is when I scoop food from the bowl directly into my mouth. Soup is one thing, but I'm pretty sure you're supposed to hold your rice bowl under your mouth and still attempt to pick up the item with your chopsticks and place it in your mouth.
....but that can get tiresome when you have the last little bits of your meal left in the bowl. I've seen plenty of native Japanese bend the rules on stuff like that, so I don't feel too bad when I do it myself.
Especially when it's a pretty casual setting.