[Bacardi]

Ou you try stop 'laughing' ?

Well, you should install SRCDS through SteamCMD and run server with addons.
Because there differences between in-game server (listenserver) and dedicated server.

When player is playing in dedicated server, server can't block all sounds from player.
There are so called "client side" effects, ex. sounds, decals and so on.

*edit
After all, SourceMod not support listenserver. Use SRCDS

*edit
I go check that 'laughing' part now...
*edit
Ok, that sound could be played by server, should stop.