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Apparently, Luigi Mangione 's been pretty chatty behind bars since his arrest last year ... at least according to one officer, who spoke during Luigi's pretrial hearing Monday.

Pennsylvania Department of Corrections Officer Tomas Rivers said he was sitting 2 feet away from Luigi's 8-foot-by-12-foot cell when the two sparked up a wide-ranging conversation about healthcare ... and the media's perception of the infamous shooting. UnitedHealth Group

According to Rivers, they had a casual conversation about private healthcare versus nationalized healthcare ... after Luigi had just been arrested on suspicion of killing UnitedHealthcare CEO Brian Thompson with a firearm.

Rivers testified Luigi had a lot to say about the polarized ways different types of media were viewing the

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