snickerers
Those who titter
People who snicker—laugh in a quiet, suppressed way, typically at someone else's expense or at something inappropriate.
The laugh is usually mocking or knowing: The snickerers in the back of the classroom were silenced by a look from the teacher.
Compare to gigglers, who laugh from amusement rather than derision.
mocker
One who derides
jeerer · ridiculer · sneerer · derider · heckler · satirist · cynic · skeptic · critic · detractor
whisperer
One who speaks softly
stifled · suppressed · muffled · hidden · covert · secretive · sly · knowing · conspiratorial · sidelong
giggler
One who snickers
joker · teaser · prankster · wisecracker · comedian · jester · humorist · mischief-maker · cut-up · wag
snickererssympathizers
Those favoring a cause
comforters · mourners · weepers · consolers · empathizers