Watches Nets Game Maskless in Stands

Kyrie Irving is throwing NYC's vaccine mandate policy right back in its face on primetime TV -- taking in a home game, maskless, from the stands ... but not able to step onto the court.

The awkward scene played out live Sunday during the Nets' home game against Knicks ... which was being carried by ESPN. During the 2nd quarter, the camera panned to KI, who was shaking hands with people down near the bottom of the stands, and then going up to his seat a few rows up.

In this capacity -- as a spectator -- he's totally okay to not wear a mask and move about ... as that is now NYC's policy on events like this, regardless of vaccine status. However, their rule pertaining to private employees hasn't…