Thomas Borchert writes:

If you can't provide this, you are obviously a slanderous liar.

No, I'm simply not willing and/or able to provide it. That says
nothing about whether or not I'm telling the truth, and it is
unrelated to spoken defamation (slander).

You haven't provided anything to support your point of view, but that
does not make you a liar.

Calling someone a liar without being able to prove it is libel in some
cases, however.

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