Please provide the source for this assertion. Otherwise I call blatant red herring -- no Apple owner I've ever known or read about has made that claim.
OBTW, please supply a link to a reputable source -- not just another raving internet forum commentard.
Running no antivirus or protection of any kind means they feel their computer is safe enough to run on a public network without security issues. It’s implied based on the attitude.
Only military-grade systems on isolated networks are secure enough to not require a security scanning and feedback mechanism. Does this make sense now?