lol relax it was joke albeit a poor one. I have never seen the word aplomb used in a scouting report before. I suppose when scouts write hundreds of reports they need to crack open the thesaurus to avoid repetition.
I agree the Internet has redefined the English language but words like aplomb are not a part of 1970's lexicon nevermind 21st century. My AP English teacher -best teacher I ever had and he taught for 50 years- once advised to never write using words that you wouldn't use in everyday conversation and used "thus" as an example. When was the last time you used the word aplomb in a conversation?
Your AP English teacher is rejecting an enormous amount of interesting or euphonious words that can liven up your writing. Aplomb is a pretty garbage word as things go, it's awkward to say and has thus fallen out of common usage, but it's a perfectly cromulent word. Looking in a thesaurus for a word sucks - I recall someone in my AP english class revealing that he would often go through his essays with the MS Word Thesaurus and using that to make his writing more interesting, which is horrendous. So yeah, I get being against that, and I get being against the dense writing of academia, but language gets pretty dull if you limit it to the words you say.
So yeah, in conclusion, use Moore words, not less.