Unreasonable things that annoy me include threads being improperly followed, like this one. It's not a general "things wot bug me", people.
This is a perfectly reasonable complaint by me, so if it annoys you, just say so. That would work.
And on topic ... the people in my local shops who now know me by face if not name, and reasonably anticipate why I've popped in to their business. This annoys me because it marks me down as predictable, set in my ways, which I now am, not a free and adventurous spirit, which I am not (and never really was).
e.g. in the local SE Asian takeaway, the owner greets me with a smile and says - more statement than question - "Nasi Goreng?".
But I don't want him to know that I'm the "guy who always orders Nasi Goreng". I want to peruse the menu, hum and ha, annoy the people waiting behind me ... and then say "Nasi Goreng".
Sometimes I want to mess with convention, destroy his well-ordered world and order something else entirely, while fixing him with a challenging stare. But then, I couldn't have my Nasi Goreng.