The 21-year-old risked the ire of supporters following the Magpies' 2-1 home defeat to Premier League strugglers Reading on Saturday.
The striker argued that Newcastle did not have to buy season tickets or pay the players' wages.
Ranger wrote: "Certain fans need to not come and support this team... Coming out to BOOO us.. Stay at home.. Don't need ur BOO's.... SAY NO MORE !!!!
"To all the fans. U are not forced to buy season tickets.. Or pay our wages.. Please remember that.
"If u are loyal fans.. Be with us.. When we are out there on the field.. Be the 12th man.. Don't come and BOO.. That aint going to help any1.
"Team is going through rough patch.. Last thing we need is fans against us.
"We are a TEAM u BOO 1 player... Ur booing all of us !!!"
The remarks sparked an angry response from Toon fans and could see Ranger disciplined by Newcastle boss Alan Pardew.