This is delightful, and if I might take it another step without being a bother, I like to think Elrond has this skill to switch between ruffian and coutier too.
I mean, he was raised first in a refugee camp and then by a pair of wandering war criminals without a home base (at the time) as essentially camp followers. I bet there were days in the late first age without easy food and shelter, days where Maedhros and Maglor felt too tired to put on airs of civility, days where it was more practical to sleep in gear you could run and fight in at a moments notice.
I bet he and Elros were returned to Gil-galad looking like the world’s most battle ready pair of Woodchuck Scouts, complete with greasy mannish hair and appalling ideas of what is eatable.
And now all of his children absolutely have the ability to dazzle high society but also flee a falling city at the drop of a hat. Just… Elrond as the original genteel passing Dirt Boi.