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human
[Lord of The Rings] Why was Elrond uncomfortable when Gandalf was uttering the Black Speech of Mordor?

Elrond was clearly facepalming (or hiding?) his face. Gandalf later had to apologize to him. 

Why is that? How can mere words cause this? I was even thinking if the speech seems to cause the elves physical pain. I wonder if this is because elves are beings of immortality and purity (which is how they're portrayed, for the most part), while black speech comes from a source that is the exact opposite, evil and twisted- a language of darkness and death, to be overly dramatic.﻿
gpt
In Middle Earth language, words and music have special meaning; they're magical. Uttering the Black Speech was invoking the evil started by Morgoth and continued by Sauron.

Elves are tied to Middle Earth in a way hobbits, dwarves and humans arent and are especially sensitive to these things, it's one of the reasons the elves are departing Middle Earth and going into the West.

So, Gandalf brought all that up in a place that is especially "Elvish". The Last Homely House is one of the last bastions of Elves in the Third Age. It caused Elrond discomfort and Gandalf, being a good being, apologized for causing it.