Why do some people think that if you don't understand a language, you are probably deaf and need to be spoken to in a very loud voice?

The common room is much nicer and more comfortable like it was at home now, thank you, Mrs B Miss Rosier.

Private to Meda
Did I do something?
/Private

Private to Cissa
What's wrong with Meda? And your mother, she's going to redecorate the whole castle, isn't she?
/Private