You might sound like Inspector Morse; he was repeatedly correcting Lewis. Here in England, "everyone" doesn't say "who" when they mean "whom".
"Who is it addressed to?" versus "To whom is it addressed?"
Anyway, I can't remember when I last heard someone use "whom" outside of slightly cheesy television series like Morse...
Morse can be cheesy, but I thought it was a cultural reference that Americans may know. :-)