“Irk”: Great word.
When I was at university I was considered laid back, easy going, accepting, slow to warm up, just a real nice guy. During several varieties of psychological tests (a common way for starving students to make a few bucks) I was calm, never got rattled, avoided panic and often ending up winning the “game.” Then went to grad school and became much more confrontational.
Through the years I have encountered little things that, if only momentarily, shatter my calm acceptance. In popular parlance I believe these would be considered “pet peeves.” Unfortunately, the term “pet peeve” is possibly my biggest “pet peeve.” A peeve is an annoyance, something that irks someone, but the use of the word “pet” to (presumably) denote something personal, possibly uniquely held, I balk.