It's kind of annoying when you want to do a default taunt, like drinking from a bottle as demo or even a taunt kill, but instead do some random, silly looking dance.
the thriller taunt is a part of halloween mode. disabling it means having to disable the entirety of halloween mode as well (which means no soul collecting, weapon spells or restricted cosmetics). theres no way to disable the taunt outright other than simply not default taunting or using weapons with kill taunts
After much consideration, I regret to inform you that this feature will not be removed from our servers. Halloween is a limited time event. Removing this feature would force us to remove the entire mode. Furthermore, this event will expire soon. It would be a waste of time and effort to do as such.