Someone who laughs in a quiet and often unkind way.
The word 'snickerer' can make people think of someone being mean or making fun of others.
Examples:
The snickerer laughed quietly at the joke.
The snickerer made fun of the boy.
The snickerer was not nice to the other kids.
The snickerer thought the joke was funny, but it wasn't.
The snickerer always laughs at people, and that's not nice.
The snickerer is not a good friend.