Grealish experienced constant jeering from the home fans as he performed on the St James' Park pitch.
The midfielder's taunts of Miguel Almiron remain fresh in the memory of Magpies fans, who barracked him during the 1-1 draw.
ChronicleLive says Grealish made a 'shush' gesture to fans as he left the pitch at the final whistle.
Grealish was ushered down the race by City officials as Toon fans gave him an earful.