Slander is verbal defamation while Liable is written defamation.
Someone would have to claim you did something illegal or claim a person has a disease like Aids to get anywhere in a defamation case. Then you would still have to prove that the person knows what they are saying is false. If a person believes it is true or claims insanity, good luck with a defamation suit.
This is reply is not directed at anyone in particular.
IMNAL