crashfrog writes:
I think it's bad logic, at least, to imply that one bad argument or one mistake - or even one act of dishonesty - makes someone a fool or a liar.
In the present context, the person was called a fool because of a lifetime of (perceived) foolishness - not "one act". There may be a technical fallacy in there somewhere, but I don't think it's "bad logic" to make a comment about consistent behaviour.
“Faith moves mountains, but only knowledge moves them to the right place” -- Joseph Goebbels
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