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Bryan Kohberger is crying that fellow inmates inside his Idaho prison are taunting him by yelling at him through vents ... but prison officials say that's just how guys in the joint talk to each other.

Here's the deal ... inmates at Idaho's Maximum Security Institution are reportedly taking turns screaming into the vent that leads to the cell where Kohberger is in solitary confinement , and the admitted murderer whined to prison guards that the noise is preventing him from sleeping.

The Idaho Department of Corrections tells TMZ ... "We are aware of Kohberger's complaints about what he considers taunting. Incarcerated individuals commonly communicate with each other in prison."

The IDOC adds ... "Bryan Kohberger is housed alone in a cell, and IDOC security staff maintain a s

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