- When you say "Thank you" to someone (normally service style people - hotel staff and the like or shop assistants) who has done something for you or hands something to you, and their reply is just a dismissive "Uhu" without even looking up or even giving any sort of eye contact or acknowledgement that they give a shit that you are still there.
I may have mentioned this before, but it makes my fucking teeth grate every.....single......time.
- When (see above) and they reply "Sure!" Very nearly as annoying but not as dismissive. It makes my teeth grate every other time. Just for perspective.