Yeah, it's happened to me at times too. Have to keep myself in check. There are plenty of other things to get annoyed about in Japan that are actually real. Like at the conbini, their insistence on piling my change on top of my receipt before handing it to me.
I don't know who told them to do that, but it needs to stop. But if I was back in the states I'd be annoyed with probably bigger issues, so I try not to complain that much.