Calling a little boy a "little man."
"As to" (as in "enquire as to whether X is available") - rarely adds anything meaningful to a sentence.
Saying passive aggressive to mean someone is not saying what they mean. That's not what passive aggressive is!
Calling a vacuum cleaner a Hoover if it's not a Hoover.
Poorly - ugh! Just say ill, or if it's not that serious, not very well. Actually I think the most infuriating use of this word is one someone who is very ill, or dying, is described as "very poorly."
Haven't got a clue. I have no idea why I hate this one so much but I much prefer just "I don't know."
Passed away for died.
Nudist camp (or colony) for naturist club.
Brexit. It's bad enough that we probably have to have it, without giving it a silly acronym.