Don't speak unless...
you can improve on the silence.
People that are extremely loud when talking will be disruptive to the people around them. It is a matter of common sense that if you are a loud talker people tend not to want to talk to you.
Beyonce says "I hate when I am in a movie a there's always this person that disrupts the movie with their loud comments about the movie..."
No one likes a loud talker. You don't need to jump off a bridge to know its a bad idea. Why then would you need to talk loud knowing that it disruptive and is annoying to the people around you.